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KS UMa superoutburst: superhumps update Dear Colleagues, We have received many new data from Jochen Pietz, Tonny Vanmunster, the Nyrola team and Nakajima-san. The data by the Kyoto team, Torii-san (RIKEN) and Okayama U. of Sci. team are also steadily growing. As reported by the Ostrowik team, the amplitude of the superhumps has grown again. The superhump profile became sharp again, although the Feb. 25 data from Nakajima-san showed some hints of double-shaped maxima. The O-C variation has shown a complex behavior, possibly reflecting the change in the superhump profile. There is no "monotonous" decrease in the period. The O-C variation and profile variation would suggest a beat phenomenon between the superhump period and orbital period, which needs to be fully examined after the data become more complete. The mean superhump period up to now is 0.07018 d. Anyway, the light variation is KS UMa is far more complex than may have been assumed! Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
