[vsnet-alert 11364] Re: OT_J223003.0-145835 = CSS090727:223003-145835

[Gianluca Masi]

Dear All,

I managed to perform another run on this star (31 July).
covering about 3.5 hours. The star was about 0.5 mag fainter
than 28 of July. So this is a long (super)outburst.

The most recent data shows a periodic modulation with a
total amplitude of 0.08 mag, with a best period estimate
(after removing the data trend) of 1.406 hours. Adding the
previos dataset, a refined period estimate of 1.428h is
obtained.

Data are ontheir way to Kyoto.

Best,
Gianluca

> Gianluca Masi reported:
> 
> > after eliminating the trend of the data, I obtained an
> > estimate for the period of 1.46 hous.
> 
>    Looking at Gianluca's original data, the light
> variation appears similar to that recorded during the
> early fading stage of a superoutburst (or a precursor) of
> short-Psh SU UMa stars (such as SW UMa). The hump profile
> was complex and multiply peaked. There also remains a
> possibility that we are observing the late decaying stage
> of superhumps.  Further observations are strongly needed
> to discriminate the possibilities.