(cba:news) sdss1642+1347, and some others
jop at astro.columbia.edu
Thu Oct 11 09:20:26 EDT 2012
Thanks Enrique and Joe U, SDSS1642 was at quiescence yesterday, the HST
safety people are placated, and the observation will start in about 1
day. Continued monitoring from now until the end of the observation
(Oct 12 6:22 UT) is *extremely* desirable - for science, as well as for
The next 5 targets are:
Monitoring of these is now timely as well. Mainly snapshot
magnitudes... but in case anyone can get time-series on RX0232-37, that
would be great! I consider it one of the most fascinating CVs in the
sky, but with quiescence quite faint (18.5-19), it usually doesn't make
And apart from HST issues...
Many of you contributed heroically to our campaigns on BK Lyn and ER UMa
in 2012. I think the papers being readied now on these stars will have
a great impact on CV science, especially CV evolution... and will
certainly have a great impact on our observing programs. In particular,
the ER UMa class. It's a small class and we should study all of 'em
over the next year (BK Lyn, ER UMa, RZ LMi, V1159 Ori, MN Dra, DI UMa,
IX Dra, V503 Cyg). Most are somewhat out of season, but:
(1) V1159 Ori is pretty well placed (plus it's so close to M42 that you
get to glance at that every night); and
(2) *short* coverage, or even snapshot coverage, is quite desirable for
these stars; their rapid up-and-down hijinks are very definitely of
interest - and so far, what make these stars so mysterious.
From the 2012 coverage of BK Lyn, I think we've learned now that the
timescale for a short-Porb classical nova to decline to quiescence is
not 30-50 years, as usually assumed, but at least 10000 years. (No typo
here.) This greatly affects our ideas of CV evolution, as well as of
novae. I expect to finish this paper around November 1, with all the
CBA BK Lyn observers (since 1999!) as co-authors of course. So:
1. If you've observed BK Lyn for us anytime since 1999, send me your
current postal address and email; and
2. I apologize for taking 13 years to write the damn paper!
Some of you occasionally give talks at your local astronomy clubs. This
could be a very interesting subject, if you're inclined to take it on.
Helena and I will be talking about the star, and these ideas, at the
Cape Town nova conference in February. We'll have some good slides to
contribute, and of course the fireworks of novae are a natural subject
for public talks anyway.
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