Return to Home Page
CI UMa: fading stage and superhumps Dear Colleagues, We have received new complete data sets (five nights) from Jochen Pietz and one night from Nyrola observatory team (Arto Oksanen). The usual data at Kyoto and by Okayama U. of Sci. team are also being analyzed. The data now clearly shows that CI UMa has entered a rapid decline phase on April 19 (with some hint on April 18). The properties of the superhumps become different since April 17. Before April 17, the period change was almost zero (with a slight tendency of period increase), while the period seems to have made a sudden change around April 17. Late superhumps, however, have not been apparent even in the latest observation, indicating that the sudden change was not associated with a phase 0.5 jump. Futher monitoring for outbursts during the coming one or two weeks is encouraged, since the superhump period of CI UMa is close to those of SU UMa stars with prominent post-superoutburst rebrightenings. Regards, Taichi Kato VSNET Collaboration team
Return to the Powerful Daisaku
vsnet-adm@kusastro.kyoto-u.ac.jp
