[vsnet-alert 6133] WZ Sge: change of profiles of early superhump

[Taichi Kato <tkato>]

WZ Sge: change of profiles of early superhump

Dear Colleagues,

    The profile of early superhumps is starting to show a dramatic change.
The profile is starting to vary from cycle to cycle.

    The "V"-shaped fadings (corresponding to the eclipse phase) were getting
broader, and became "U"-shaped in the middle part of the July 25 run.
The overall amplitude of variation was getting smaller, which tendency
had not been observed until July 25.  These changes may be a result of
the changing precession rate of the accretion disk, which needs to be
confirmed by further observations.  We have already analyzed and received
8160 data points, steadily growing in number!

    The profile of early superhumps starting to vary significantly, long,
continuous observations (as long as possible!) are strongly encouraged.

Regards,
Taichi Kato
VSNET Collaboration team

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