The January 2003 superoutburst of UV Gem

See also the April 2002 observations of this cataclysmic variable, of which we detected the SU UMa-type nature in December 1999.

Below are the data that we obtained at CBA Belgium Observatory during the January 2003 outburst of UV Gem.

The light curve of January 08/09 shows very distinctive superhumps. A rough analysis of the superhump period value yields a result of 0.093 d, although the timebase is a bit short to accurately determine the value.

Extract from <vsnet-campaign-dn 3302> by Taichi Kato : "We have received a further set of data from Tonny Vanmunster. We have further analyzed the reported data which are steadily growing! A preliminary period analysis has revealed an interesting period change. Up to Jan. 7, the superhumps were well expressed by a single period of 0.0966 d. After that, The period suddenly switched to 0.0932 d. The difference between these periods are comparable to the differences between superhump periods and orbital periods! Such a dramatic change (and a large change) in the superhump period is quite unexpected and unprecedented in SU UMa-type superhumps. Such a dramatic change may have affected the past (seemingly contractding) interpretation of the UV Gem superhumps."

Extract from <vsnet-campaign-dn 3309> by Tonny Vanmunster : "I just finished analysing the UV Gem data, obtained last night (2003, Jan
11/12) at CBA Belgium Observatory (using 0.35-m f/6.3 telescope and ST-7 CCD). Sky conditions were relatively good, and the session lasted for 4.6 hours. Using the PDM technique, I found a superhump period value of 0.0925 +/- 0.0009 d. This confirms the period change (dramatic shortening) reported in vsnet-campaign-dn 3302, by Taichi Kato."





Copyright © 2003 - Tonny Vanmunster.