[vsnet-alert 6582] WZ Sge: damping oscillation

[Taichi Kato <tkato>]

WZ Sge: damping oscillation

Dear Colleagues,

   18 days have passed since the first post-superoutburst rebrightening.
Up to now, ten distinct rebrightenings have been recongnized.  As the time
passes, it has been increasingly evident that these rebrightenings are
a damping oscillation in nature, both in amplitude and period.
The maxima of these rebrightenings have strictly followed the smooth
extension of the decline of the main superoutburst.  This general trend
would suggest the continous shrinkage of the overall disk, through which
the heating and cooling wave propagated.  The damping nature of the
oscillation may be naturally explained at a constant mass-transfer to
the progressively shrinking accretion disk.  The system now keeps
relatively constant brighteness at about 11.5 mag.  Further detailed,
intensive observations are still strongly requested in order to follow
the fate of the diminishing rebrightening oscillation.

Regards,
Taichi Kato
VSNET Collaboration team

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