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CT Hya: early stage of the superhump growth! Dear Colleagues, We have partly finished analyzing Torii-san's Nov. 12 data. The data already indicate the emergence of superhumps (amplitude 0.10-0.15 mag). A period analysis has yielded a substantially longer period than the previously determined superhump period (0.06643 d, Kato et al. 1999, IBVS 4794). This difference seems to indicate that the object was experiencing the early development stage of the superhumps. The Kyoto team (observer: R. Ishioka) also obtained Nov. 13 data. As noted in Kato et al. 1999, the superhump period change during the plateau stage was almost zero, although the accurate determination is still needed. Such nearly zero Pdots are usually observed in WZ Sge-type stars or infrequently outbursting SU UMa stars. Intensive observations during the entire plateau stage of the current CT Hya superoutburst is thus highly encouraged to study the relation between Pdots and the outburst properties. Regards, Taichi Kato VSNET Collaboration team
Return to the Daisaku Nogami
vsnet-adm@kusastro.kyoto-u.ac.jp
