Some variables from November's data set

[Patrick Wils <patrickwils@yahoo.com>]

HD932 (star numbered 1317 in the file): John mentioned this already
before, presenting it as a delta Cep, with a period of 10.3 days.  My
guess is that it is an RRc with a period of 0.322 days or an alias
thereof.  This agrees with the A5 spectrum.  Someone should go out and
observe this star to solve this.

GSC 00613-01099 (7697): An EW with a period of 0.336 days (or an
alias), mag 11.4-12.0V. B-V=0.59.

GSC 00622-00482 (10814): Probably another EW ranging between 11.1 and
11.5V. The period however is not that clear, because there are a lot of
equally important alias frequencies. B-V=0.55.

GSC 00008-00448 (1531): Also an EW ?  Mag 11.0-11.6V.  There is some
scatter around the best period of 0.286 days. B-V=0.40.

GSC 00594-00324 (124): This may be becoming dull, but it looks like
another EW, but with a smaller amplitude 10.25-10.45V, period 0.318
days (B-V=0.95).

GSC 00621-00566 (10276): Mag 11.3-11.6V, EW again, B-V=1.15, period
0.335 days ?  

I'm getting suspicious here.  All "best" frequencies of these stars
seem to be near 5, 6 or 7 cycles per days (or in fact half of those
values, because EWs have 2 cycles per period).  Is this some sort of
selection effect, because of the way the data are sampled ?

The spread on the couple of data points for most stars on JD ...561
seem very high compared to other nights.  Maybe due to clouds ?

Patrick


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