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AK Cnc superoutburst observations Dear Colleagues, We have received time-series photometry of AK Cnc during the recent superoutburst from Jochen Pietz (four nights), Nyrola Observatory team (Arto Oksanen and Pertti Paakkonen), Tanabe-san and Okayama U. Sci. team, Torii-san (RIKEN), and Kyoto data. Due to the unexpected "interruption" by GRB 030329, some of the entire large amount data (the data almost covered the superoutburst in spite of the contemoranous occurrence of the GRB!) still need to be analyzed. A preliminary analysis of a partial set of data has yielded a mean superhump period of 0.06736 d, which is slightly shorter than the literature value. The period change is almost zero, but has a slight indication of a positive period derivative. Is it likely the superhump period of AK Cnc is located close to the borderline between positive and negative Pdot systems. There have been intriguing change in the superhump profile (e.g. double-wave modulations during the early and late stages), which needs to be analyzed in detail using the complete data set. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
