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DI UMa: new superoutburst Dear Colleagues, The analysis of Tanabe-san's data (VSNET Okayama Station) taken on Jan. 15 revealed the emergence of 0.2-mag superhumps in DI UMa. The object has definitely entered a new superoutburst. The object was rising on Jan. 13, but with no prominent superhumps. Together with the long duration of the 2002 December superoutburst and the recent activities, the outburst activity of DI UMa now bears intermediate properties between ER UMa and RZ LMi. The present observation now firmly establishes the existence of a transition between ER UMa-like and RZ LMi-like behavior within the same object (see also Fried et al. 1999, PASJ 111, 1275 for an earlier suggestion of the change with less conclusive evidence). Further analysis of the data and observations are in progress. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
