[vsnet-alert 3875] Detection of superhumps in QY Per

["Tonny Vanmunster" <Tonny.Vanmunster@advalvas.be>]

Dear colleagues,

I just finished a 2.5 hours CCD photometry run on QY Per, using the 0.35-m f/6.3 telescope at CBA Belgium Observatory [1999, December 29/30]. Right now, clouds are entering the sky and chances are quite high I will have to completely abort the observing session.

All FITS images were acquired with an ST-7 CCD camera without filters, and were instanteneously processed and reduced (PSF photometry). The resulting real-time light curve clearly shows the presence of a 0.20 mag modulation, to be attributed to superhumps. A first rough estimate of the superhump period yields a value of 0.0723d +/- 0.0009d. These observations thus establish QY Per as a new (and likely interesting) member of the UGSU type of cataclysmic variables.

Further high-speed photometry is highly recommended, to settle the precise superhump period value. 

Best regards,

Tonny Vanmunster
CBA Belgium Observatory

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