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KS UMa: unusual superhump evolution! Dear Colleagues, We have received further data from Jochen Pietz (two nights) and Tonny Vanmunster. The analysis of the Kyoto, Torii-san (RIKEN) and Okayama U. of Sci. observations is also in progress. During the most recent two nights (Feb. 25-), the superhump profile has dramatically changed. On Feb. 26, the superhump amplitudes varied from superhump to superhump, sometimes accompanied by a large amplitude fluctuation resembling dips. On late Feb. 26-27, the profile sometimes changed to "triple peaks", which remind us of the profile sometimes seen during the 2001 superoutburst of WZ Sge. There has also been a dramatic change in the evolution of the superhump period. During this interval, the superhump period suddenly decreased, in contrast to the rather stable, but probably oscillating, trend brfore this change (except for the early evolutionary stage). There must have been a drastic change in the superhump evolution during the past few days. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
