(cba:news) december stars
jop at astro.columbia.edu
Mon Dec 10 07:15:38 EST 2012
Time for some changes of target.
Let's sweep V455 And and PX And off the stage. The season's getting too
late. Also V405 Aur: we have enough. Also RX0524+42 = Paloma: we
have absoltely beautiful and quite long coverage (from Tom and Enrique),
which specify the enormously intricate period structure quite well!
There are a bunch of DQ Her stars which are now "late season", and hence
seasonal for an accurate period determination during 2012. Here they are:
AO Psc, FO Aqr, V2069 cyg, V2306 Cyg, RX2123+42, and V1033 Cas. We need
only a few observations of each, with each "observation" a 2+ hour time
series of decent quality.
Then there are mid-season stars of this type: BG CMi, MU Cam, WX Pyx,
Swift 0732-13, RX0636+35, RX0704+26, and PQ Gem. Again, a 2+ hour time
series will generally accomplish the needed result (an accurate pulse
timing). Except for PQ Gem (for which a V or g filter is very desirable),
white-light is OK.
Now for mid-season targets which will especially repay LONG time series.
1. WX Ari. Now in a low state around 17-17.5. No time-series studies in
any previous low state. It could be mighty interesting.
2. V1294 Tau = "Tau 2". We once observed it with TWO superhumps - positive
and negative. But the signals were too weak to be 100% certain. Still
well placed in December, and at +6 degrees, available to both hemispheres.
3. IM Eri. Great southern target, and also for intrepid northerners (-20).
At 11.7, great target for small scopes or bright skies. Another SW Sexer
(like 1 and 2).
4. ES Cet. We need timings of its 9 minute signal. Fun target with such
a clean signal.
5. V1159 Ori and DI Ma. Keep the faith - they're going well!
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