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BZ UMa strong humps on Dec. 25 Dear Colleagues, We have been nightly observing BZ UMa since the detection of the recent outburst. Although the object has faded from the outburst, strong and highly coherent variations appeared on Dec. 25 (observation by Okayama U. of Sci. team, led by Tanabe-san). The humps had amplitudes of 0.4-0.5 mag. The best-determined period is 0.0657(7) d, which is slightly shorter than the orbital period. The mean profile is posted at: http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/DNe/BZ_UMa/bzph1.gif The profile rather resembles those of superhumps. These humps may be related to negative superhumps (superhumps have periods slightly shorter than the orbital period). On the next night, the signal appearently became weaker. Further analysis is in progress. Regards, Taichi Kato VSNET Collaboration team
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