[vsnet-alert 3777] Periodic modulation in LX And - likely UGSU cataclysmic variable

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

Dear colleagues,

In a recent VSNET message [vsnet-alert 3749], M. Uemura and T. Kato announced the discovery by M. Watanabe (VSOLJ) that variability in LX And was not in accordance with the object's classification as a RVb-type star. Based on earlier observations of Uemura and Kato, they concluded the object could be a dwarf nova with an outburst period of approx. 28 days.

During the most recent outburst of LX And, I obtained CCD photometry of the object during 3 successive nights [Dec 1 - 3, 1999], each hampered by some clouds, using the 0.35-m f/6.3 telescope at CBA Belgium Observatory. All FITS images were acquired with an ST-7 CCD camera without filters, and were instanteneously processed and reduced (PSF photometry). The combined light curve clearly shows the presence of a 0.05 mag modulation, which I believe has the characteristics of a superhump signal. The corresponding period is 0.085 d +/- 0.001 d (PDM method). 

I would be interested to know if other people attempted CCD photometry on this object. By combining our observations, we probably can conclude on the nature of the object, as well as on the periodicity of the modulation.

Best regards,

Tonny Vanmunster
CBA Belgium Observatory

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