Albert Jones- The Interbiew

Although the quantity of variable star measurements is not as important as the quality, after studying the great observers past and  present, it became obvious to me that to reach 100,000 variable star observations in a lifetime would be quite an accomplishment. There are only a handful of observers who have had the patience, persistence and talent to achieve this in a lifetime.

One of these legendary observers stands head and shoulders above the rest, Albert Jones. Now 89 years old, this quiet, unassuming New Zealander has made over 500,000 variable star measurements over the last 60 years or so. He has received honors from the Royal Society of New Zealand, the American Association of Variable Star Observers, the Smithsonian Astrophysical Observatory, the Astronomical Society of the Pacific, the British Astronomical Association, the Royal Astronomical Society, and has received an Honorary Doctorate of Science from Victoria University in Wellington, New Zealand.

In 1964 he was made one of the first four Fellows of the Royal Astronomical Society of New Zealand, and in 1987 he was awarded an Order of the British Empire (OBE) for his services to astronomy. Minor planet 3152 was named after him in 1988 in recognition of his achievements. If you are involved in variable star astronomy, you know who Albert Jones is. This list of honors and awards does not even begin to tell the whole story. I asked Albert if he would grant an interview, and he kindly accepted. I found Albert Jones, the man, even more inspiring than the legend.

During the process, we sent several emails back and forth. In one of the early ones, I misspelled the word “Interview” in the subject line. Albert was far too kind to ever make note of it or correct it, so we sent several more emails back and forth with “Interbiew” in the subject line. For the rest of my life, I will always remember this as 'the Albert Jones Interbiew’.

Mike: Let’s start at the beginning. Tell us about your parents and family. Do you have any brothers or sisters?

Albert: I was born in 1920 in Christchurch, New Zealand. My mother was such a kind loving person, dedicated to husband and family. Father was a breakfast food miller and head of that department where he worked. There were two brothers and one sister.

When my parents went to school, before 1900, only primary education was free. Secondary education had to be paid for, and like most others, it was beyond their means. Around 1930, when I was at school, primary education was free, then one had to pass an exam to gain two years of secondary education, then another exam to go to the next stage. To go further and to be admitted to a university, one had to pass the Matriculation Exam. I did that at the end of 1936, during the depression years, a time during which there was widespread unemployment, and even people with university degrees had to take on menial work, like digging ditches, to earn a living.

So I found a job instead of furthering my formal education, but that did not stop me from teaching myself from books. Later on, people urged me to retrain in the hope of finding a better job, but by that time I was so hooked on variable star astronomy that I wondered whether I might not have much time for observing if I did better myself, so I was happy as long as I could carry on observing.

Mike: What was it like growing up in New Zealand in the first half of the 20th century? How have things changed since you were a child?

Albert:  I can still remember when the ‘wireless’ was a novelty and telephones were a luxury, and of course, motor cars (automobiles) as well. Roads were made of shingle (stones) and few roads were sealed with bitumen, many vehicles were horse driven.    

When I started school, we were taught writing on slates using slate pencils and as we grew older we wrote on paper using pencils and pen and ink. Things we take for granted now, TV, computers and the internet were not even thought about.

Mike: How did you first get interested in astronomy?

Albert:  From an early age I wanted to know about the sky and stars and planets. I do not know how I became so fascinated by them. All I can remember is that my inquiring mind wanted to learn more. Parents and friends helped me with what they knew.

After I left school at the age of 16, I was well aware of my limited knowledge and never dreamed that one day I might be able to make a contribution to Astronomy, but for my own fun, and to satisfy my curiosity, I could at least learn the constellations and be able to recognize planets. So with the aid of books, I did that.

Then in answer to a request in the newspaper for reports of aurorae, I made detailed notes of the next aurora that I saw, sent it in and was thrilled with the reply stating it was the best report received. So two years later, I timidly asked if there was an astronomy club or society that might accept me as a member. Soon after, I became a member of the New Zealand Astronomical Society (later to become the Royal Astronomical Society New Zealand; RASNZ). Then I started receiving their journal ‘Southern Stars’.

Mike: I think every astronomer remembers their first telescope. Tell us about your first telescope.

Albert: My first telescope was the crudest thing imaginable. An inexpensive lens kit consisting of what may have been a simple spectacle lens of about 20 inches focus and a small negative lens for the eyepiece. I made a tube for the telescope by wrapping paper around a rod as a pattern, and gluing the layers of paper. Although the images were very poor, it at least allowed me to see things. I can still remember the thrill of seeing the Orion Nebula I had read about in books.

Later a bigger lens kit showed me the rings of Saturn. The tube was a cardboard one that had once been the centre of a roll of carpet. A simple tripod made the telescope usable for viewing objects like star clusters and planets, even the rings of Saturn.

Then I heard that a local man had an old telescope he was not using, so I bought my first real telescope, a 5-inch f/15 reflector, evidently made for viewing planets and the Moon. The finder was so tiny that it was difficult to find faint star fields away from bright stars.

Mike: At some point you decided to start observing variable stars. Tell us about the first variable star you began observing.

Albert: As I mentioned above, the journal ‘Southern Stars’ became available and helped me immensely, especially after the discovery of Nova Puppis 1942, because one of the co-discoverers, a New Zealander named Alex Crust, wrote an article for  ‘Southern Stars’ about the nova. It included a chart with comparison stars plus instructions on how to make estimates of it as it faded.  I did not need any encouragement to look at it each clear night, and after I had made 50 estimates I posted the estimates to Mr. Crust, who wrote another article for the journal and listed all estimates to date. Imagine how thrilled I was to find that not only were my estimates worthy of inclusion, but they compared well with others. Those first observations starting in January 1943 proved that making observations of variable stars was within my capability,

Mike: Frank Bateson, the founder and long-time director of the Royal Astronomical Society of New Zealand's Variable Star Section played a key role in your interest and development as a variable star observer. Tell us about Frank and your relationship with him over the years.

Albert:  Yes Mike, the following year Frank Bateson returned from the Navy to civilian life, and in reply to my request to join the Variable Star Section, he sent me charts of 25 variable stars.  At first I thought that I had bitten off more than I could chew, but as I gained experience in locating star fields, I soon had the 25 stars on target and asked for more stars. The next batch of 43 stars again made me think I had over-done it, but before long I could locate all those stars.

One handicap was the tiny finder. Even now I can remember my frustration one night looking for S Apodis by star-hopping from Gamma Aps, over 3 degrees away! All the intervening stars were too faint to see through the finder. It took me an hour to locate the field. I was determined to find it and did not want to admit defeat.

Mike: You also began sweeping for comets early on, and discovered your first comet in 1946. Tell us about your discovery of Comet Jones 1946h.

Albert: I did some comet sweeping with the old reflector and successfully recovered  Comet P/Kopff, before anyone else, they say. I located it from  the ephemeris in the BAA Handbook.

Then I heard of a 5-inch refractor that was for sale, and that one was far better to use. The finder objective was larger and enabled me to star-hop to fainter fields with confidence. I also used it for comet sweeping.

One morning in August 1946, I had unsuccessfully swept the south-east and found only permanent celestial scenery. I noticed dawn was imminent, so decided to see if I could see U Puppis, as by then the field should be low in the eastern sky. The finder was too high at that position to look through it from standing on the ground, so I hurriedly aimed the main telescope at the region of Puppis using a low power. I swept down to locate the variable, but on the way I noticed a fuzzy object.

I made a quick field sketch, but dawn stopped viewing before I could notice any motion.  I did not get to see the variable that morning. Rather than make a false ‘discovery’, I waited until next morning. The sky was clouded over, but luckily the clouds moved away in time for me to find the position where the object was the morning before. It had moved away.

I kept sweeping until I located the comet. I notified Ivan Thomsen at Carter Observatory who spread the word. That was Comet 1946h. Soon afterward, I realized that variable star observing was not only more fun but also produced real results right away. So I concentrated on variable stars instead.

The 5-inch refractor was later replaced by an 8-inch reflector made up from bought optics. Aperture fever later led me to purchase a 12.5-inch f/5 mirror, which I made up into the telescope I still use now.

Mike: Your second comet discovery came in 2001, when you were 80 years old. That is quite a long time between discoveries! Not only is that 54 year gap a record, but you are the oldest person to have discovered a comet. What is the story behind your second comet discovery?

Albert: In 2000, I learned that Dr. Brian Marsden was stepping down from head of the CBAT (Central Bureau for Astronomical Telegrams) so I wrote to congratulate him on his retirement. In reply, he told me that he was not retiring and was staying on to support Dan Green who had taken on the position. He mentioned that it was a long time since I found a comet and it was time I found another. But that is easier said than done.

A few months later, I was star-hopping to T Aps when I noticed a strange fuzzy object and made a note of the position. I phoned Alan Gilmore at Mount John Observatory and told him I had seen a comet that morning. I felt sure it must be a known comet that I had not heard about and I asked Alan its name. Alan replied that he had not heard of such a comet, so he reported it to the CBAT. Brian Marsden wondered whether it might be the same comet that Syogo Utsunomiya had seen only once a week before which had become lost. That turned out to be the case. So it now has both our names. Brian Marsden emailed, “I told you what to do!!”

Mike: The home-built 12.5” telescope you have used since 1948 is named Lesbet. That’s kind of an odd name. Who is it named for?


Albert:  That is another story. Back in 1947, I  wanted an even larger telescope and airmailed to Dr. Les Comrie, a former New Zealander who had revolutionized the British Nautical  Almanac Office by replacing math tables with mechanical accounting machines, which he found could be adapted to do mathematical astronomical calculations.

Dr. Comrie was very kind to up-and-coming amateurs. I wrote to him and asked where in the UK could I buy a larger f/5 mirror and he replied that his friend James Hargreaves had a mirror blank that he could grind and figure to f/5, then pack it in a box in time for Dr. Comrie to bring to NZ by ship as he had plans to come to NZ to visit his father in late 1947. That suited me fine as it saved me the bother of getting an import license and permission to send money to England, as well as arranging the freight.

When Dr. Comrie came to NZ he forwarded the mirror to me, I paid for it by sending the money to Dr. Comrie's account in a large business in Auckland. With the money, Dr. Comrie paid for food parcels to be sent to his friends in England who had not seen luxury food during the war, so everyone benefited besides me. I named the telescope Lesbet after Les and his lovely wife Betty. Les always said she had a perfect figure too!

Mike: There was quite a bit of excitement in 1987 when supernova 1987A went off in the Large Magellanic Cloud. You are credited with co-discovering the brightest supernova seen since the 17th century. How did that come about?

Albert: I was monitoring some stars not far from the Tarantula Nebula. On that fateful night, while I was observing stars elsewhere in the sky, I noticed some clouds coming over so I poked the telescope at my targets in the LMC. I was quite surprised to see a bright stranger, so I noted its position on the chart. But before I could make a magnitude estimate the clouds moved over. I phoned Bateson who started phoning others for confirmation. Then the clouds moved away and I made an estimate of the stranger before phoning Bateson again to tell him. He then phoned the Observatory at Siding Spring, in Australia, to tell them about the star. I have been told that everyone at the Observatory stopped what they were doing and turned their attention to the supernova. Rob McNaught then checked the photos he had taken and found the star was recorded on them.  

Rob then phoned Dr. Marsden to say he had a photo of it, but as Brian was already on the phone to Chile, Rob told the secretary. Dr. Marsden then phoned back to Rob to congratulate him on the discovery, but Rob said he was not the discoverer. It was discovered by someone in NZ, but did not know who it was. Dr. Marsden correctly guessed who it might be.

Mike: Perhaps your greatest discovery is your wife, Carolyn. How did you two meet, and how has she supported your passion for the stars?

Albert: My first marriage was such a disaster that I thought of ending my life. Fortunately, I did not and we parted. I vowed never to marry again, but changed my mind after Carolyn joined the same hiking club. I could not help secretly admiring her. Then when two years later, I found out that she thought the same about me, I changed my mind for the better. Carolyn was such a kind, lovable person and so different that I instinctively could tell she would be the ideal person to live with forever. July 2009 was our 25th wedding anniversary- the happiest years of my life.

Mike: How active are you these days? Do you still submit observations?


Light Curves of RU Lupi-
Top curve is AAVSO data without Albert Jones archival observations. 
Bottom curve is the same time period with Albert Jones observations included in the AAVSO International Database.
From the AAVSO 2007 Annual Report


Albert: I continue to observe variable stars each clear night, and besides sending my observations to AAVSO, I send data on selected stars to over 30 professionals worldwide.

I like to start observing as soon as it gets dark, and as I have had lots of birthdays, after observing for 3 hours I become so tired that I have to stop. Then I go to bed and get up again an hour or two before dawn and observe stars that have come up in the east.

The thrill of seeing with my own eye how variable stars change has not palled a bit, and to know that what I report is of value to Science is an added bonus. Especially, on a cold winter morning, when I may feel reluctant to leave a warm bed. Once I have put on a few extra layers of clothes and dragged the telescope out of the shed I feel it is so worthwhile.

 Mike: Even if we knew everything there was to know about variable stars, and therefore no real reason to keep going out night after night to observe them, would you keep observing anyway?

Albert: As long as my well-being and eyesight allow me to get to the telescope, there would be a number of stars that I would like to keep monitoring to satisfy my curiosity and for fun.

Mike: After discovering two comets, a naked eye supernova and making over half a million variable star observations, what is it that still drives you? What else would you like to accomplish or discover?

Albert: Just looking and looking, in case I might discover something, might become boring. So I carry on monitoring stars for Science. And if something new is noticed serendipitously, that would be a bonus. There are lots of my old estimates that were made before reliable comparison star magnitudes became available from sources like the All Sky Automated Survey, so I hope to revise as many as I can while I am still able.

Mike: What is the greatest difference between observing and reporting observations now and in the past?

Albert: Over 60 years ago there were charts for lots of variable stars, some not as good as those available now, so it is good to obtain better charts and finding charts for them. Long ago, one had to draw finder charts from what one saw through the finder. Now finder charts can be made using PC software and printed by modern computer printers.

PCs and software are great for entering the observations from my logbooks, and it is now so easy to sort the individual stars, and select which stars go to whom by email. No longer does it take lots of writing by hand. I could go on and on, but let me just say how lucky observers are today with all this modern technology to take a lot of the drudgery off their hands.

Mike: Thank you for taking the time to let us get to know you.

Albert: Well Mike, I do hope that I have not bored you with all this.

Thinking back over the years, Carolyn and I have enduring memories of the wonderful people who have come into our lives through Astronomy.

I sincerely hope that anyone reading this will realize that serious work can be undertaken with only basic gear. If one has access to a modern telescope with all the bells and whistles, please have a go at variable star observing. But do not despair if you do not have such equipment, as so much needs to be done and can be accomplished with very modest gear. I know- been there, done that. The main thing is to have fun.

Carnival of Space 130

This week's Carnival of Space is hosted by the Chandra Blog. There are a lot of excellent pieces in this one, but the Simostronomy 'Carnival Ride of the Week' goes to Lounge of the Lab Lemming's post Stars Get Lonely Too. He discusses the mental health of stars in our sector of the galaxy, and that is all I'm going top tell you, so you'll have to read it. Trust me, it's a winner.

And if you are half as sick of hearing about water on the Moon as I am, you will love Alice's Astro Info Blog this week. She has created a table of news releases for news releasers. The Moon Has Water is not an original idea for cripes sake! (yawn) This should be mandatory reading for anyone planning on usng that as a headline...ever again! A Simo-'Tip-of-the-Hat' to Alice.

Don't miss Weirdwarp's blog about all the Space Debris in orbit around Earth.The statistics are pretty alarming. The potential solutions are interesting. This is a good read. 

They all are. Check it out!

Caroline Moore and Supernovae on Slacker Astronomy

The latest Slacker Astronomy podcast is all about various types of supernovae and features an interview with the youngest person to ever discover a supernova, Caroline Moore.


Caroline Moore (middle) displays the award give to her by the AAVSO in November 2009.
Paula Szkody, AAVSO President (left) Arne Henden, AAVSO Director (right)

So click here or go to http://www.slackerastronomy.org/wordpress/ to hear the latest podcast.

Carnival of Space #129

The Carnival of Space is back with its 129th installment. This week it is hosted by Tiny Mantras.


Contributing bloggers this week include:
Chandra X-Ray Observatory blog
Dynamics of Cats
MSNBC's Cosmic Log
The Planetary Society Blog
Mang's Bat Page
One Astronomer's Noise
The Lunar and Planetary Institute
Next Big Future
Astroblog
collectSpace
Weird Warp
Simostronomy
AstroEngine
Centauri Dreams
Cheap Astronomy
Colony Worlds
Kentucky Space and Alice's Astro Info

Enjoy!

Tom Boles- Supernova Supersleuth



In August 2009, British amateur astronomer, Tom Boles broke Professor Fritz Zwicky’s 36-year-old record for the number of supernovae discovered by an individual when he bagged his 124th supernova. The fact Tom has been so prolific, observing from the cloudy, rainy United Kingdom makes this record even more remarkable.


Tom has graciously agreed to give us a look inside the process, the tools and the reasons behind his stunning success.

Mike: What brought you to astronomy in the first place, and how did that evolve into a passion for discovering supernovae?

Tom: Hi Mike it’s good to talk to you.
Like so many amateur astronomers it happened at school. A boy in my class brought in a small telescope and let me look through it at Saturn and the Pleiades. (I lived in Scotland then and it is dark at 5 pm in winter) I was hooked immediately.

Searching for supernovae seemed a logical progression. I have always been interested in cosmology so there is a strong tie as supernovae are essential tools for studying the large scale Universe.

As you rightly say, the skies in the UK are less than ideal. It is difficult to find many good nights suitable for photometry but there is rarely a clear night when I don’t attempt to look for SNe. Even on very poor nights the brighter galaxies can be imaged. They are often not pretty pictures that I record but suitable for purpose, only the limiting magnitude drops.

Mike: Tell us about the observatory. Where is it located, how was it financed and built and what instruments do you currently employ in your search program.

Tom: The observatory is based on the periphery of a little quiet town called Coddenham in the heart of rural Suffolk in the UK. I moved here from central England because the light pollution there had deteriorated. Suffolk also offered me the chance to get a few extra clear nights each year. As a rule, the weather system in the UK improves slightly as you move farther east and south.

There are only two street lights in the village and they are in a dwell which keeps their glow hidden on all but the mistiest nights.

The observatory was privately financed by me. It was part of my ‘master plan’ when I took early retirement to get more involved with astronomy and supernovae in particular. I use three C14 SCTs on Paramounts. Two of my Paramounts are the original design and were the early form of the new ME. The third is the slightly later black version the 1100 which was the immediate precursor to the ME. I use three Apogee AP7, thinned and back illuminated CCD cameras which help me to get use from every photon the C14s provide. I think this is near the ideal set up for supernova hunting other than moving to much larger telescopes.

I did have a scare a couple of years ago when the observatory was struck by lightning. I lost three PCs, my network and one of the Paramount’s electronics. I was down for several months. Thankfully I had excellent support from Software Bisque who patiently talked me through replacing several controller boards that they supplied. I was glad on the excellent support that I received.

I built the observatory myself, not that I wanted to but when I described what I wanted to professional shed builders they just laughed and shook their heads. On reflection, I am glad that I did. Many challenges arose during the construction. I could work them out in bed at night. Had I had a tradesman it would have overrun and cost me a fortune.

Mike: How much of the process is automated? Do the telescopes work unattended, controlled by software, or do you control them to some degree from a control room nearby?

Tom: The telescopes are controlled over a local area network. The control room is in my house only about 100 feet from the observatory. I produce scripts, which consist of lists of target galaxies for the cameras to image. They point, settle for a few seconds, image, name and store each image automatically. A typical script is 200 galaxies long and will run unattended for up to 4 hours. I rarely leave them unsupervised in case the weather changes. On good nights I use 30 second integrations and on poorer nights 60 seconds. This can mean I collect up to 135 images an hour between the 3 systems. The image collection is the easy bit. Checking the images is where the hard work is. In mid winter, darkness can last 13 or 14 hours; that’s a lot of images. I use one PC to control each telescope and another indoors to monitor the images coming down and to ensure all is well. An additional one with an extra large screen is used to check the images against my master/library images.

Mike: You currently monitor around 12,000 galaxies. How has your search program evolved over time? Do you monitor a specific type of galaxy to maximize your efforts?

Tom: I started off very modestly just checking a few galaxies. That meant nice open face on spirals that maximized the chances of seeing the supernovae free from obscuring dust in the galaxy. I then added edge on spirals and moved on to others like SO galaxies and even irregulars and ellipticals. I use a galaxy’s size and recession velocity to give me an indication whether the SN will be too faint to see or not. To get to 12,000 galaxies I had to drop some of my criteria and add many other morphological types. Eventually the recession velocity (galaxy distance) where it was known, was the only criterion. I patrol 12,000 frames, that is, master fields. In practice there is often more than one galaxy in the same field so the full image needs to be checked.

As I added more and more galaxies I started to look for ways of making the search more effective. I soon split my galaxies into 3 categories depending on their brightness and distance. I do the easier ones on the poorer nights and vice versa. I also run a patrol worksheet which schedules how often I try to observe any given galaxy. This is to make sure that every part of every script gets sufficient attention. I also changed the order that I patrol galaxies so that the telescope has the minimum of movement between images. This speeds things up and maximizes the number of images I can capture. More images of course mean more supernovae.

I also never leave anything to memory. In the small hours your brain is not at maximum efficiency. I use a check list that I mechanically go through to eliminate anything that might not be a real supernova.

Mike: How many images have you taken to discover 127 supernovae, as of November 2009? Do you examine each one by eye, or do you have some part of the ‘blinking’ process automated as well?

Tom: I often get asked this question and fortunately it is easy to answer. I keep a very detailed log book of all my patrols. I also store every image that I have ever taken. These are used to eliminate unknown variables that appear in the fields. I check every image of a galaxy before I report a suspect. This sounds tedious but it isn’t. The log book and filing system make it easy.

I have recently celebrated breaking through the 500,000 count for images. It doesn’t take too much arithmetic to estimate the average discovery rate by patrol number and the number of hours spent patrolling.

I use two blinking methods. This is a recent development and has helped my productivity immensely. I use a small program called ‘GrepNova.’ This is a free program developed for me by Dr Dominic Ford from Cambridge University.  A search on Google will show this up. The other program I use is Visual PinPoint. Each of these is best suited for different types of field, that is, whether the field has many reference stars or not.

Mike: Do you do follow up observations, and build light curves of your discoveries, or do you just keep the telescopes churning, looking for new ones?

Tom: The only time I do follow ups is when requested by a professional team who is also working on the supernova. I have no filters mounted on any of my systems so that I can get the maximum limiting magnitude on any given night. I usually achieve a limiting magnitude of around 20.5. I usually only admit to 19.5 to keep my reporting easier. That does mean that most of my discoveries are in the range 17.5 to 18.5. My skies are very challenging to do photometry on SNe this faint.

Mike: Can you explain the difference between the two types of supernovae, and why they are astrophysically interesting or important?

Tom: This used to be easier to answer than it is today. Once upon a time it used to be type Ia SNe and all the others. Type Ia are the sexy ones at the moment. Lots of progress has been made recently with these. They are not standard candles as once thought but they are ‘standardizable’ candles. This means that they can be used to measure cosmological distances and so discover the size and age of the Universe. They were used to discover the acceleration of the Universe at the end of the last century. All the others are core collapse supernovae. These occur when massive stars reach the end of their lives. These include all the type II SNe and the Ib and Ic types. The latter are often associated with Gamma Ray Bursters (GRBs) and are particularly interesting. Core collapse SNe shed their inner elements into space. By measuring the elements present and their quantities, it is possible to model what is happening in stars’ hidden interiors.

Mike: Have any of your discoveries been unusual or special, resulting in a research paper or further investigation with larger telescopes or satellites?

Tom: These change constantly. I was very proud of 2003L. This was the second most powerful supernova in history. That record didn’t last too long as new specimens keep getting discovered. Only last week a new paper was published describing one discovered behind the Magellanic Cloud that pushes it into somewhere like 5th or 6th place.

Strangely, I was also a co-author in a paper published in Nature on 2006jc. This was a SN that ‘appeared’ twice, once in a pre-explosion years earlier and then finally in 2006. It was a very useful tool for astrophysicists. I didn’t even discover that one. All I did was use my 12 years of archived data to prove that it hadn’t flared at any other times. There’s a good lesson here about keeping conscientious notes and logs.

My latest is still current and is the optical transient UGC2773-OT that I discovered in August 2009. Five teams are currently working on this very sub-luminous candidate. It is probably not a SN at all but an unusual outburst by a Luminous Blue Variable (LBV) star. It is only visible because the galaxy is so close. The precursor has been imaged by the HST.

All the major telescopes in the world, and in space, have followed up one or more of my supernovae. The VLA in New Mexico follows up all the radio noisy ones like 2003L. Very often a barrage of telescopes gets involved with the interesting ones, including the HST and space telescopes such as Chandra. My biggest thrill was when the 200 inch Hale was used. This was the biggest telescope in the world for so long when I was a boy and I remember marveling at its pictures at school. It is a thrill to know that these telescopes are looking at something because of something that I did. Patrolling is a lot of hard work and seeing large telescopes following up on your work keeps the motivation alive.

Mike: Is it still as fun and exciting after 127 discoveries as it was when you first started some 13 years ago?

Tom: I think it is more fun. When I made my first discovery I was terrified. I didn’t know what to do or whom to tell and I was afraid that I could make a false report. I was stressed for several days until it was confirmed spectrographically. With more experience that fear goes away (not entirely, which is good, so the buzz is still there) as a result I can enjoy my discoveries more as they happen.

Mike: Do you ever do any other kind of observing, like enjoying the night sky with a pair of binoculars or a small telescope while the C-14s are busy patrolling the universe?

Tom: I have a whole range of telescopes and binoculars. It will be a sad day when I stop using eyepieces. I have a ten inch that I use for visual use. I also take it to local schools and groups for Outreach sessions. In a few weeks I am accompanying a group of tourists over the Atlas Mountain in North Africa as their ‘teaching’ astronomer. They want to learn something about the skies and discuss cosmology over several bottles of wine by the camp fire in the evening. Astronomy is fun no matter how you do it. If it ever stops being fun I will stop doing it.

Mike: Do you have any advice for anyone considering supernova searching?

Tom: First of all expect some hard work before making your first discovery.  AND IMPORTANTLY, you DON’T need expensive telescopes to do it. The Messier galaxies are being neglected by most patrollers. They are just too big for our tiny CCD chips. It would take me all night to check M31 properly. Visually it can be done in seconds. So the advice is, check the messier galaxies and the Caldwell and the brighter NGC galaxies. Do it as part of your normal observing run. The key is not just to look but to check. Some discoveries have been photographed by other people first but they didn’t check their images. Looking is not the same as checking. A SN discovered in one of these bright galaxies is often more valuable scientifically than a dozen fainter ones.

Finally, speak to someone already doing it and get encouragement and advice. They will save you a lot of effort.  Most patrollers are happy to help. I am happy to help anyone wanting to give it a try.

Mike: Is there anything else on your supernovae wish list, like finding one in our own galaxy?

Tom: I need to be realistic. The first person to discover a SN in our galaxy won’t be me with my narrow fields of view. It will be someone walking along a lane and looking up, enjoying the sky, and spotting a constellation that no longer looks familiar. It will happen. Our next galactic supernova is well overdue. I bet when it comes it will be like busses, two or three will come together.

From a personal point of view I would like to discover another type Ic SN similar to 2003L probably associated with a GRB.  SN2003L didn’t fit any of the theories for how central engines power SNe. Alicia Soderberg at the VLA in New Mexico proposed that it might be a new type of SNe. It was a very powerful SN with a very weak central engine. I won’t hold my breath. Even if it is, less than 1% of SNe are bright enough to qualify, so it could take longer than the next SN in our galaxy to prove it.

Mike: Thank you, Tom. It’s been great learning all about you and your discovery process.

Tom: Thanks Mike. It’s been a pleasure and privilege to take part.



You can see Tom's observatory and the full list of his supernovae discoveries at his observatory website.

Twinkle, Twinkle, Quasi-Star



 

"Twinkle, twinkle quasi-star
Biggest puzzle from afar
How unlike the other ones
Brighter than a billion suns
Twinkle, twinkle, quasi-star
How I wonder what you are."

George Gamow, "Quasar" 1964.

The AAVSO recently announced a special observing campaign on several blazars, including the unusual variable object 3C 66A. So, what the devil is 3C 66A, and what is a blazar?

In the 1960’s advances in radio and x-ray astronomy opened our eyes to new classes of objects we’d never even imagined before. Some of these early discoveries were radio sources we believed were associated with stellar objects. The Third Cambridge Catalogue of Radio Sources (3C) is an astronomical catalogue of celestial radio sources. It was published by the Radio Astronomy Group of the University of Cambridge in 1959. Entries in this catalogue use the prefix 3C followed by a space, then the sequential discovery number, such as 3C 48. In the case of 3C 66A there are two sources very close together in the sky, so they are given an additional letter suffix, resulting in the names 3C 66A and 3C 66B.

3C 66A was one of these radio stars. As hints of their true nature began to unfold, astronomers began calling them Quasi Stellar Radio Sources, which was eventually shortened to ‘quasars’. The spectrum of 3C 273 taken during an occultation by the moon finally revealed that these radio stars were actually galaxies. Even more remarkably, these were the most distant galaxies known, billions of light years away.

Like quasars, blazars appear star-like optically. They emit energy in radio wavelengths as well as all other wavelengths up to gamma-rays. Due to their variability in optical and other wavelengths, these objects have all come to be known as Active Galactic Nuclei, or AGNs. Blazars are the most variable of all the AGNs and can change in brightness by up to a factor of 100 in a few months. BL Lacertae is the prototype of this class, and as you can guess by the name was first thought to be a variable star.

AAVSO 1000 day light curve of 3C 66A
The engines that power these active galaxies are believed to be supermassive black holes residing in the nucleus of the galaxy. These super compact objects can possess the mass and gravitational pull of a million to a few billion Suns. Surrounding the massive central region is an accretion disk. Beyond that is a doughnut-shaped torus of dust and gas extending out another couple of light-years, which glows in the infrared.

Due to the physics of accretion disks, the inner disk rotates more quickly than the outer portions. The inner parts near the black hole are spinning so rapidly and are so hot that very high-energy wavelengths are generated. Gas and dust spiral in towards their eventual doom, like water circling a giant cosmic drain. A massive amount of energy is emitted when matter accretes onto the black hole via the accretion disk, and vast amounts of gravitational energy are released as the matter gets sucked down the drain and disappears from the universe.

In some AGNs, radio jets are produced which protrude perpendicular from the disk, spewing energetic particles at nearly the speed of light. Our point of view relative to these jets is what distinguishes the different types of AGN.


Looking at the jet straight on, right down the barrel of the beast, we see blazars and quasars. However, if the jet is not pointed in our direction, the dusty disk of the galaxy lies in our line of sight, and we see what are called Seyfert galaxies.

So the answer to our initial question, what is 3C 66A?
It is an active galactic nucleus, a quasar, a blazar, and a variable source of radiation in optical and other wavelengths, powered by a supermassive black hole in a galaxy billions of light years away.

Why has the AAVSO asked observers to monitor this crazy cosmic catastrophy?

Observations have been requested by Dr. Markus Boettcher, from Ohio University, in a study he and his colleagues are making of several blazars. These AGN are being intermittently monitored by VERITAS (the Very Energetic Radiation Imaging Telescope Array System), a four-telescope collection designed to detect sources of very high energy (VHE) gamma-rays. If a VHE gamma-ray outburst is detected by VERITAS, target-of-opportunity observations with the Newton X-ray Multi-Mirror (XMM) telescope will be triggered.

The VERITAS telescope array

Since VERITAS is not regularly monitoring the targets, optical monitoring by observers on the ground is crucial to alert the VERITAS collaboration if any one of the blazars on their list enters a high state of activity. AAVSO observers will essentially act as fire spotters, and if we see smoke, professional astronomers will turn the big guns on these blazing beasts.

Details of the campaign and the list of targets can be found in AAVSO Alert Notice 353.

I have observed 3C 66A for years. Partly because it is a variable object, but also because it is remarkable as the most distant thing I can actually see in my 12” telescope. Now I have an even better reason to watch it closely in the coming months. My observations, from my humble back yard observatory, could trigger target of opportunity observations of the XMM Newton satellite. You have to admit, that’s cool.

The Sky Is Falling, the Sky Is Falling!

Meteor watching doesn’t require any special equipment at all, but is best enjoyed when the moon is out of the way. Fortunately, this year’s Leonid meteor shower peaks November 17, right around New Moon. If the sky is clear, you could be in for a treat.

Leonid meteors start out as specks of dust and debris ejected by Comet 55P/Tempel-Tuttle, which orbits the Sun every 33 years. Over time, these particles spread out along the comet's orbit. Every November, Earth passes through this stream of cosmic debris.

These particles hit our atmosphere at 147,000 mph and vaporize in the upper atmosphere from friction with the air. This produces the streaks of light in the sky we call meteors. Leonids are swift, dashing meteors that often have flares at the end of their trails. Some of them leave behind persistent trains, like tiny vapor trails from jets.

By the way, when these particles are flying through space they are known as meteoroids. If they survive the fiery ride through the atmosphere and hit the ground they are called meteorites.

This meteor shower is called the Leonids because if you trace all the shower's meteor paths backward, they appear to radiate from a point in the constellation Leo the Lion. This point of origin is known as the radiant. The Leonids radiant is very near Gamma Leonis.


Observers are normally rewarded with 20 to 30 meteors per hour, but the Leonids have surprised us in the past. In 1833 the Leonids shower was actually a meteor storm, with a hundred thousand meteors per hour putting on a show. In 1966 observers in the US saw Leonids falling from the sky like rain, at a rate of thousands per minute. In 1998, the year of Comet Tempel-Tuttle’s last return to the inner solar system, there was a brilliant display.

The peak of activity coincides with when the Earth passes through the thickest part of the debris trail left behind by Tempel-Tuttle. Predicting just when that will happen is difficult, but predictions seem to get more accurate each year. If you’re lucky you could see hundreds of meteors. If not, the few dozen you see will be reward enough for some time well spent under the stars.

I’m willing to go out on a limb and make a prediction. If you don’t go outside and look up in the next few days, you won’t see any meteors.

The Z CamPaign

Introduction
UGZs are defined in the General Catalog of Variable Stars as dwarf novae that “show cyclic outbursts, differing from UGSS variables by the fact that sometimes after an outburst they do not return to the original brightness, but during several cycles retain a magnitude between maximum and minimum. The values of cycles are from 10 to 40 days, while light amplitudes are from 2 to 5 magnitudes in V.”

So it’s all about the standstills, those episodes where the star gets stuck at a mid-point between maximum and minimum. If it doesn’t exhibit standstills it isn’t a Z Cam star.


Typical standstill of Z Camelopardalis


So UGZ can be classified by their light curves alone. Orbital period is not a factor in classification, even though they all tend to be on the long side of the period gap, 3 hours to 10 hours orbital period.
There is no strong agreement between the various CV catalogs as to which few dozen or so stars are actually Z Cam type systems. There are a handful of bright objects that have been densely covered by amateurs throughout their range that are obviously UGZ from their light curves. They show the typical Z Cam-like standstills, have short outburst cycles and amplitudes around 3 or 4 magnitudes.

There are also some bright systems listed as UGZ, like AB Draconis, that have the short cycle and small amplitude, don’t show obvious standstills, and yet it seems everyone agrees they are UGZ.


AB Draconis- where are the standstills?

There are many more CVs that have some of the characteristics of UGZ, but it is not at all apparent from the existing data that they show standstill behavior because the range at which you would expect to see this, somewhere mid-point between maximum and minimum brightness, is too faint for visual observes to have accumulated useful data over the years. All we really know from the data is the average outburst cycle and approximate amplitude. There is no detail in the middle where the real story lies.

Depending on which catalog you use, there are only 30 to 40 Z Cam dwarf novae. If any significant percentage of the number of Z Cams eventually proves not to be Z Cam, the remaining few represent a fairly rare and unique class of stars worthy of further investigation.

Oddballs
Other well-quoted characteristics are that “standstills are always initiated by an outburst,” and “standstills always end with a decline to quiescence” (Hellier, 2001). This may be convenient because it fits the expected behavior, if the models are correct, but there are at least three Z Cam stars that appear to go into outburst from standstill, HX Peg, AH Her and AT Cnc. If this is in fact true, it throws a real monkey wrench into current CV theory.

Hibernation
Another interesting idea is that these Z Cams may be part of a population of “hibernating novae.” According to theory, classical novae systems can evolve into hibernating novae when the secondary star underfills its Roche lobe and mass transfer ceases, possibly centuries after eruption, causing the binary to go into hibernation.

Mass loss during the nova event (or events) results in an increase in orbital separation. The secondary, induced by irradiation of the red dwarf's surface by the white dwarf, continues mass transfer onto the white dwarf. Through this continuous mass loss, the secondary star eventually underfills its Roche lobe and mass transfer ceases.


The shell of ionized gas around Z Cam detected by the Galaxy Evolution Explorer
 is explained as the remnant of a full-blown classical nova explosion.

Credit: NASA/JPL-Caltech/M. Seibert(OCIW)/T. Pyle(SSC)/R. Hurt(SSC)

The binary systems that are most likely to go through hibernation after a nova outburst suffer the largest reduction in mass transfer and increase in separation. In particular, systems with a higher mass ratio are more likely to be induced into hibernation.

The Z CamPaign
The list of stars in the Z CamPaign can be found here.
Stars highlighted in yellow are stars that are confirmed UGZ suitable for continued observation by visual observers throughout their cycles. We strongly urge visual observers to continue monitoring these stars for their expected outbursts and standstills.
Stars highlighted in green are stars that visual observers should continue to monitor for outbursts and standstills if or when they may occur.
Stars with no highlights are stars which both visual and CCD observers are encouraged to monitor for outbursts, but the standstills are likely to only be visible to CCD observers due to their relative faintness (15th or 16th magnitude).
Stars highlighted in blue are best suited to CCD observers for monitoring for outbursts and standstill behavior.
Stars highlighted in red are those which appear to go into outburst from standstill. When one of these stars enters a standstill we will be asking for intensive coverage until the star either goes into quiescence or outburst.
We will devote a special place on the home page for notifications and reminders of current Z Cam and suspected Z Cam activity, the Z Cam Corner.
We also plan to build a website devoted to Z Cam and suspected Z Cam stars, with pages for individual stars, finder charts, data tables and links to relevant literature, along the lines of The Big List of SW Sextantis Stars (D. W. Hoard) and Intermediate Polar Home Page (Koji Mukai).

Science Goals
1. To determine convincingly which CVs are indeed UGZ and which are imposters.
2. To improve the overall data available on each of these stars and fill the gaps in the light curves.
3. To determine if some UGZ actually do go into outburst from standstill, or if perhaps we have just missed the sudden drop to quiescence before the next outburst, leading to the appearance of outburst from standstill behavior.
4. To make any other serendipitous discoveries about 'UGZ-ness' that come to light as a result of improved coverage.
5. To publish the results in a peer-reviewed journal such as the Journal of the AAVSO.
Z Cam stars are not the sexy, super-humping members of the CV family. In fact, they are rather ignored for the most part by amateur and professional alike. Perhaps because it is easier to make a classification of a UGSU from only a few nights observations of superhumps, or because the reason for standstills to occur is not well-understood. This leaves the door open for discovery to those patient and persistent enough to devote time and energy to observing this unique class of cataclysmic variable. We hope you will join us in this endeavor.

Catching Up

Okay, I'm back! After a rare two week hiatus, we have quite a bit of catching up to do!

While preparing for the AAVSO fall meeting, and then away attending the meeting, I haven't had time to keep you all up to date on what is going on in the variable star and astronomy world that whirls around me each week. So we'll take a few steps back and then plow forward.


October 31, AAVSO announced a special request for observations of 3C 66A, an active galaxy in Andromeda, while it is in its current highly active bright state. I planned to write a blog about this since it is one of my favorite variable objects, and at 2 billion light years, the furthest object I can actually see in my telescope. I hope to write about it this week, but there is a lot of new activity that may take priority over it.

Also just at the end of October the fourth nova in Sagittarius for 2009 was discovered. It is now known as V5584 Sgr. Just yesterday, a new possible nova was discovered in Scutum.

Saturday, November 7, the Slacker Astronomy crew, Michael, Doug and I, aired an episode on 365 Days of Astronomy about the recent, extremely bright, bolide that exploded over Canada, very near our friend Doug's university!

The AAVSO Cataclysmic Variable Section has begun a long-term observing campaign to monitor Z Cam type dwarf novae. I presented the first of what will be several research papers on this at the fall meeting November 7.

I've also started a new web site devoted to Z Cams that I hope will become the authoritative reference on this topic in years to come. I'll be writing more about this exciting project in the weeks to come. This news has not been announced anywhere else except at the AAVSO meeting last weekend, so you readers are getting a scoop here.

Previews of other things coming down the pipe

I interviewed Caroline Moore, the youngest person to discover a supernova, at the fall meeting. She is an incredible young lady. That will be airing as part of a Slacker Astronomy podcast soon.

I have another 365 Days of Astronomy Simostronomy podcast coming up December 7. Its called 'Don't lick the telescope, and other observing tips for winter.'

I received an advance copy of 'The Monthly Sky Guide' by Ian Ridpath and Wil Tirion, so there will be a book review coming soon.

Something notable always seems to happen just around the holidays, a new nova, a rare CV outburst, or something else. What will it be this year? Stay tuned, and we'll find out together.

Double Dipping- Autumn

Most nights, I race through my variable star observations, trying to log as many as I can get as fast as I can go, before the weather changes, I run out of steam or the Sun comes up. I hop from field to field; completely ignoring celestial wonders just a few degrees away. When the longer, clear, dry nights of autumn finally come, I am tempted to take a few extra minutes along the way to take in some sights and try new challenges.

Lets say tonight is one of those glorious clear, moonless, autumn nights. You’ve decided to stop and smell the roses along the way, but you’d still like to make some variable star estimates. Or maybe a couple friends or family have stopped by for a late dinner, and now they want to look through the telescope. You need a plan. 

Obviously, we’ll start in the west and north with targets that will begin to fade into the haze of the horizon if we don’t get them right away. Since it is still experiencing a record minimum, in magnitude and duration, I think we should be sure to observe R CrB first. This star could be considered a deep sky wonder itself. Usually visible in binoculars as an unassuming sixth magnitude star inside the ‘Northern Crown’, R CrB undergoes sudden, random fading episodes, sometimes to 14th magnitude. As of this writing, it is hovering just above 15th magnitude, where it has remained for longer than ever before in recorded history.  In the same low power telescopic field is the semiregular variable TT CrB, ranging from 10.9- 12.1, just north of R CrB. If you have a telescope large enough to see R CrB around 14.8, you may want to continue on from TT CrB to the bright 7th magnitude star to the NW, GCS 2039 0642. Just about 10.5 minutes north of that star is a faint, round 14th magnitude galaxy, NGC 6001. I’d put identifying this in the ‘challenge’ category. To me it looks like a slightly fuzzy star, but hey, we’re just getting started.

Before you leave CrB be sure to at least check in your finder to be sure the recurrent nova T CrB hasn’t erupted. If it has, you’ll see a bright star forming a triangle with epsilon CrB and delta CrB. Stop everything at that point and send out an alert. Forget the faint fuzzies!

Much more impressive in a telescope is M5 in Serpentis. This is about as low as we want to go, and this is a better summer target, but the irregular variable Z Ser is only 38 arc minutes away, and this star is almost totally ignored by observers. AAVSO has very little data on it. The GCVS lists a range of 9.4-10.9, and a period of approximately 88 days, so it should be interesting and easy to follow. Why don’t you adopt this star into your program, and pick it up again in spring when it comes out of conjunction. It will give you an excuse to observe M5 on a regular basis without diminishing your serious variable stars observer status.

From there we swing north to the great globular M13 in Hercules. Even I’m not so jaded that I don’t like to take a few minutes to take in the finest globular cluster visible in the northern sky. But let’s not get carried away. Waiting for us about one and a half degrees NW is the fine Mira variable W Her. W Her varies from 8th to 14th magnitude, so it’s usually visible in an 8-inch scope, and always visible in a 10 or 12-inch.

About halfway to our next destination is an anonymous little star cluster in Lyra, easily visible in your finder scope. Just to the east of the two brightest stars in the cluster is CY Lyrae, a fun little U Gem star that is fairly active, outbursting into the 13th magnitude range every couple weeks or so. Even if it’s not visible tonight, you won’t have wasted your time visiting here. This one is off the well-beaten path of deep sky wonders. It’s a pretty well kept secret amongst variable star folk, and we aim to keep it that way, so shhhh…don’t tell anyone. 

If you have company at the observatory, M57 is one of the stops you’ll make anyway, so here is your chance to quickly locate and show them a real crowd pleaser, the Ring Nebula in Lyra. Located in the same low power view as the ghostly ring of this planetary nebula is another Mira variable RX Lyr. If you make it a point to observe this variable this month you’ll be able to make a positive observation as it is just beginning to fade from maximum, around 11.2, on its way to the inner sanctum. It spends a lot of time fainter than 14th magnitude, so I always consider it a treat to make a positive observation of a variable so close to M57.

Our next stop is in Draco, the Cat’s Eye Nebula. Located about midway between zeta and delta Draconis, this is another bright planetary nebula on the usual star party agenda. Yes, it’s nice. Take a few moments to soak it in and explain to your guests how planetary nebulae are the remnants of old evolved stars, and then swing about one degree SE and you can show them two such stars in one field, W and X Draconis, one of my favorite “twofers” in the sky. X Dra is located next to an unmistakable triangle of field stars and should just be visible in a 10 or 12-inch around 14th magnitude if you hurry. Like RX Lyr, it spends a good deal of time fainter than 14th magnitude and has a period of 257 days. W Dra ranges from 9-15th magnitude, so it is almost always visible in medium sized scopes. These two are only 14 arc seconds apart, so they are in the same medium to high power field.

From there you can glide into the Milky Way, starting your tour with everyone’s favorite double star, Alberio, beta Cygni. Beta 1 Cyg, the orangish K star of the pair is even suspected of being variable, although I doubt you could do much to prove or disprove this visually. But it is one of those fun facts I like to throw in just to discourage guests from ever coming to a star party at my observatory again! From there it is a relatively easy jump to M56, a globular with a bright core, about 3.75 degrees NW of Alberio, and then almost due east 4.7 degrees is one of the prettiest star fields containing a variable star in the sky. The variable is EM Cyg, a Z Cam star that varies from 11.9 to 14.4, so it is always visible in medium sized telescopes. After you’ve made your estimate you can encourage visitors to slowly slew around the area getting lost in the diamond-clustered field against an ink-black backdrop.

Continuing along the body of  “The Swan” to the NE you’ll come to chi Cygni. With a dramatic range from naked eye visibility (magnitude 3 or 4) to 14th magnitude, this is one of the AAVSO ‘legacy Miras’; with data going back a hundred years or more. If tat isn’t enough to impress visitors you can track down any number of star clusters, planetary nebulae or diffuse nebulae within a couple degrees of this variable. In fact the area east of chi is a large bright diffuse nebula with the sexy name GN 19.50.2. If that doesn’t impress your guests, slew NW to the “Blinking Nebula” and demonstrate averted vision with the ‘now you see it, now you don’t’ planetary nebulae NGC 6826.

You’ll have to go south again to visit the Dumbbell Nebula, M27. Then you can take a break from the telescope to observe one of the stars in the 10-Star Training Tutorial, eta Aquilae. This is a bright Cepheid observable with binoculars or the naked eye. The observant visitors will want to know what that bright star is in the south, so be prepared to blow your dark adaptation with some glaring views of Jupiter and the Galilean satellites.

By now M31 should be high enough to see with the naked eye from a dark site. You can show visitors where you’re pointing the telescope next while you explain that the Andromeda Galaxy is the furthest thing you can see with the naked eye, some 2.5 million light years away. After you get an eyeful of Andromeda you can swing over to another AAVSO favorite, RX And. This active Z Cam star ranges from 10.3 to 14.0 and it is always doing something. It’s either trying to hide around 14th magnitude, in outburst at 10 or 11 or stuck in a standstill somewhere in-between on any given night.

A little further east and you’ll come to U And, a nice well behaved Mira that varies from 9.9 to 14.4 in 346 days. It’s in a very nice field of stars with a bright triangle of 8th, 9th and 10th magnitude stars to the NE of the variable.

This is a good point to stop. If you really want to squeeze in one more deep sky treat you can slew south to M33 before capping the telescope and calling it a night. Depending on how late it is in the evening or the season, hints of the winter sights to come may be just visible in the east as Orion begins to rise into view. In the next issue, we’ll talk about deep sky treats and variables worth braving the arctic air of a northern winter.