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BC UMa superoutburst: superhump period change Dear Colleagues, We have received new BC UMa observations from Jochen Pietz (2 nights) and Nakajima-san (2 nights), further analyzed the Kyoto and Torii-san (RIKEN) observations. The superoutburst still continues even after 12 d of the detection of the outburst. The period change of the superhumps is rather unusual and complex. After the initial period of the period increase, the period suddenly started shortening. Up to now, the mean period of the superhumps decrased by 0.5%, which is an unusually large value. The overall period bahavior somehow looks like that of AL Com in 1995, but the amplitude of the variation is larger. Further analysis and observation are in progress. Thanks to the excellent midnight visibility, the coverage has been surprisingly good. Please keep the present excellent coverage and continue for some while even after the expected transition to quiescence. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
