HD932

[Chris Lloyd <cl@astro1.bnsc.rl.ac.uk>]

Using data John sent me for HD932 and two near-by stars I've done
differential photometry and can confirm what everyone believed, that it is
variable - probably a W UMa (again), with P=2/(n.1), with n small. In fact
there are only a few likely periods so a couple long runs should crack
it. It is still well placed to observe.

In the process I have discovered that the differential photometry is
really quite good. The two comparison stars I used were GSC 00008-00599
(#1309) and GSC 00008-00313 (#1251) which according to Tycho-2 have delta
V=0.34+/-0.036 (se) while TASS gives 0.320+/-0.002 (se). The standard
deviation of the TASS delta V is 0.022 while Tycho is near 0.3.

I guess this has been mentioned before but one of the limits on the TASS
photometry is the relatively poor Tycho photometry used for calibration.

I'll put some plots up somewhere - is it okay to post them to this list?

Chris