[vsnet-campaign 1137] WZ Sge rapidly fading from the second rebrightening

[Taichi Kato <tkato>]

WZ Sge rapidly fading from the second rebrightening

Dear Collgeaues,

    We have received new data from T. Vanmunster, D. Starkey and S. Kiyota.
Newly analyzed Kyoto data have been also added.

    The data confirm the rapidly fading trend reported by T. Vanmunster.
The fading continues during Starkey's latest observation.  The rate of
the fading is 0.85 mag/d, and seems to be accelerating.

    The eclipses are even more prominent, and have a mean depth of 0.07
mag.  The sharp superhumps are seen at phase 0.85 (the actual hump maxima
are probably slightly later, being deformed by the overlapping eclipses).
Other small hump structures are also seen at other phases (the phase-averaged
light curve will be later posted on the VSNET WZ Sge page).

    The present fading trend and rate are very reminiscent of the rapid
fading following the first rebrightening.  The main difference is the
presence of strong superhump signals even at maximum.  The present behavior
look as if the star is trying to stuck to the superoutbursting state,
but so far failed.  Since the time-scale of vasriaitons have become quite
short, continuous observations are most urgently needed.

Regards,
Taichi Kato
VSNET Collaboration team

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