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Dear colleagues, Two comments regarding UV Gem : 1. I just finished another observing session on UV Gem at CBA Belgium Observatory (2003, Jan 11/12). Sky conditions were relatively good, and the session lasted for about 4.6 hours. Superhumps are again prominent. I haven't further analysed the data yet (I need some sleep first), but will make them available tomorrow. It will be interesting to see if the shortened superhump period is persistent. 2. The period change reported yesterday (vsnet-campaign-dn 3302, Taichi Kato) apparently resulted in a period value of 0.0932 d. This value is very close to the one I published during the April 2002 superoutburst, i.e. 0.0926 +/- 0.0010 d (vsnet-alert 7284). See www.cbabelgium.com for a discussion on my April 2002 observations. Kind regards, Tonny Vanmunster CBA Belgium Observatory email : Tonny.Vanmunster@cbabelgium.com website : www.cbabelgium.com -----Original Message----- From: owner-vsnet-campaign-dn@ooruri.kusastro.kyoto-u.ac.jp [mailto:owner-vsnet-campaign-dn@ooruri.kusastro.kyoto-u.ac.jp]On Behalf Of Taichi Kato Sent: Sunday, January 12, 2003 4:25 AM To: vsnet-campaign-dn@ooruri.kusastro.kyoto-u.ac.jp; vsnet-superoutburst@ooruri.kusastro.kyoto-u.ac.jp Subject: [vsnet-campaign-dn 3307] UV Gem: further period shortening! UV Gem: further period shortening! Dear Colleagues, We have received new data from Jochen Pietz. Together with the newly analyzed data at Ouda, Kyoto, Tanabe-san (VSNET Okayama), Torii-san (RIKEN), we have confirmed that the superhump period is decreasing, in addition to the sudden change reported yesterday. The rate of decrease in superhump period is around -3*10^(-4), which is comparable to what we saw in KK Tel (with less convincing statistics and coverage), see Kato et al. (2003) MNRAS in press (astro-ph/0210674). The case of UV Gem is remarkable not only in its overall amount of the period change but also in the unprecedented manner of different stages of period evolution. Further observations are strongly encouraged! Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
