I went to the Astronomy Festival on Jan 27 organised by
Galway Astronomy Club. Worth seeing;
it attracted about 100 people (the Hotel conference room was full); successful for a town
like Galway, so frequently covered in Cloud.
Dr. Lucie Green save a good talk on Solar Physics, describing the different
methods we now have of exploring the Suns behaviour, Flares, Sunspots, etc. and
the different missions such as SOHO and the new STEREO mission to observe the Sun.
Prof. Chris Dainty gave a clear presentation describing the state of the Art in
Adaptive Optics, and work his group has been doing, both in Astronomy and
pushing AO into other fields, such as opthalmology (treating the eye as the
obstacle and observing the retina behind) and productising A.O.
for 'non-professional' use. He hopes in the near future to be able to provide
Adaptive Optics to Amateurs (price range around Eur 5000, status: not ready yet,
the first units would be for 'University Dept' observatories, costing 20-30k,
in the next year or two).
Of particular interest were one by Prof. Dick Butler, head of the Chemistry dept. here in
NUIG;
it was on Organic Chemistry and meteorites. He is a long-time amateur astronomer but professional chemist;
he was particularly interested in the organic chemistry of the
Murchison meteorite.
After pointing out the out the false alarm of
ALH 84001,
he gave a convincing presentation of the extra-terrestrial origin of complex organic compounds, including amino acids, etc. in the Murchison meteorite. In particular he disputed claims that the meteorite was contaminated, pointing to the Deuterium enrichment of the compounds within; as the C-D bond is stronger that C-H, Carbon-Hydrogen compounds are more likely to be broken up by extraterrestrial radiation that their deuterium variants, leading to deuterium enrichment over terrestrial equivalents. Later he gave a nice summary of conditions on Saturn's moon Titan, pointing to its rich supply of organic compounds, showing that when hit by meteorites, lakes of water would be possible for several hundred years at a time, as the impact craters cooled, and called Titan a utopia for organic chemistry exploration.
This seems to make the idea of
panspermia: life originating off-Earth more plausible. For a while now I've had a book (found in the Bargain bin somewhere) by
Fred Hoyle and
Chandra Wickramasinghe,
From Grains to Bacteria, a collection of papers documenting their belief that they've discovered bacteria in free space via
spectroscopy. I must admit my spectroscopy is not up to challenging them; time to dig deeper and fish it out.
Dr. Aaron Golden gave a very interesting talk on
Brown Dwarfs: Planets or Pulsars that he and his students have been doing.
Basically it turns out that while Brown Dwarfs have long been seen as the 'runt' of the Stellar world, stars that didn't make it, some of them it seems are Pulsars.
(He's invented the acronym SPUDs: Sporadically Pulsating Ultracool Dwarfs, for them;
maybe it'll help people remember that Pulars were originally discovered by
an
Irishwoman, too).
This was first seen by Andys Postgrads Greg Hallinan and Steve Bourke - (see the papers).
Kinda interesting as Aaron studied under Dr. Andy Shearer in NUIG working on Pulsars, so
knew a bit about them, and had seen behaviour like this before, with a bit of a clue
what might be causing it. It was wierd going to this talk; Andy hired me to work
in
ICHEC, and we have an office in NUIG; Greg and Steve
work down the hall, and indeed, I see them occasionally working on our computers;
but didn't know what they'd been working on until now.
So, it appears that these Brown Dwarfs (they've seen Pulsar behaviour in several)
have Starspots (details
here and
here; some hot-off-the-press stuff: rumour has it he was checking the results of
observations from the night before to ensure they didn't disprove what he was about to
say). Aaron was pointing out the coherent maser behaviour was similar to that seen
at Jupiter, leading to its strong radio emissions. I didn't get to talk to him
about it in detail, but the idea of an Object with both sunspots and
clouds
sounds fairly exotic and interesting.
Beyond that, the Festival was a good opportunity to see what Irish Amateur Astronomers
have been doing, and meet some interesting people. Kudos to all those who organised it.
Amita noticed as soon as she got up ("EGGS!!"), and ran around the house picking up eggs, breaking them in half, and eating the grapes inside. She also got an improvised Easter "basket" -- they didn't have baskets at the store, so I got a little Easter gift-bag instead -- with apples, a chocolate bunny, and a stuffed duck. Pretty good haul.
This afternoon we're going out to a cabane sucre -- a traditional "
