[vsnet-campaign 1121] WZ Sge rebrightening! and humps, eclipses

[Taichi Kato <tkato>]

WZ Sge rebrightening! and humps, eclipses

Dear Colleagues,

   By combining the reported data, it has become evident that the amplitude
of superhumps decayed on late Aug. 20 (UT).  The system started to brighten,
as reported in earlier messages.  The superhumps decayed as the system
rebrightened.  The most recent data from Pietz indicate the presence of
only weak superhumps with amplitudes 0.03-0.04 mag.  However, the phase
of the superhump maxima is on an extension from the pre-rebrightening
observations.

   Eclipses have become weaker as well.  The center of eclipse seems to be
slightly earlier than the predicted times, though this needs to be confirmed
by further observations.  It is not clear yet whether this change in the
eclipse phase and depth is more associated with the rebrightening phenomenon,
or the beat with the orbital period.

   Intensive observations are very urgently requested, since some of
WZ Sge-type dwarf novae (AL Com, V2176 Cyg) showed a rapid decrease of
brightness after reaching the second maximum (maximum of rebrightening),
followed by an immediate brightening returning to the (second?) superoutburst
plateau.

   Please also remind HST and CXO observations are scheduled today!

Regards,
Taichi Kato
VSNET Collaboration team

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