Re: Something for tonight?

[Patrick Wils <patrickwils@yahoo.com>]

--- Tom Droege <tdroege2@earthlink.net> wrote:
> I was looking for a star for Michael K. in last nights data when I
> came across one that varied 2 mag in a day.  I turned out to by
> Y Psc.  It is good to know that the scheme finds variables that
> are known to exist.

It doesn't always have to be a large amplitude star for which the
variability is confirmed.  The statistic intended to find short period
variables I programmed (I have found out that this has been called
"mean square successive difference" in the literature on time series
analysis), turned up SY Equ as the second most probable short period
variable from the September data set.  This is a Beta Cepheid of mag
8.5 with an amplitude of somewhat less than 0.1 mag.  One night of TASS
data shows exactly that !  
The WS statistic is only 1.02 for this star, due to a (probable)
zero-point shift of the Ic magnitudes for a few observations on a
second night.

Patrick


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