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KS UMa: dramatic change in the superhump period Dear Colleagues, We have received further data from many collaborators. The analysis of the latest data from Nakajima-san, Maehara-san, Jochen Pietz, Tonny Vanmunster, Donn Starkey, Kyoto team, Okayama U. Sci. team, Tanabe-san (VSNET Okayama Station), Torii-san (RIKEN) has revealed a dramatic change of the superhump period which occurred on Feb. 25. After that time, the superhump maxima have been well expressed by a single period of 0.06987 d, which is closer to what had been previously reported. The superhump profile is now clearly double-shaped, with its minimum more striking. An examination of long continous runs has confirmed the unstable (strongly variable) superhump profile. KS UMa is now confirmed to be an object with a large sudden change in the superhump period, following an early stage of unstable period fluctuation. Further observations are encouraged to fully follow the evolution of this "atypical" evolution of the superhumps. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
