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DM Dra: rapid amplitude dacay and refined superhump period Dear Colleagues, We have received further nightly data from Torii-san (RIKEN), and more runs from Nogami-san (Hida observatory) and Kyoto team. The best superhump period up to March 13 is 0.07567(2) d. To our surprise, the amplitude of the superhumps seems to have quickly decayed during the observation on March 11. On March 13, the full amplitude is reduced to 0.1 mag. Such a rapid change is rather unexpected, but may explain the apparent non-detection of superhumps during the late stage of the 2000 October superoutburst, cf. Kato et al. (2002) IBVS 5284. In any case, further continuous observations are strongly encouraged to fully illustrate the seemingly unusual evolution of the superhumps. Regards, Taichi Kato VSNET Collaboration team
Return to the Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
