[vsnet-alert 6514] WZ Sge: maximum of the fifth rebrightening

[Taichi Kato <tkato>]

WZ Sge: maximum of the fifth rebrightening

Dear Colleagues,

    We have received a large amount data, from K. Morikawa, University of
Athens Observatory team (K. Gazeas, A. Yushchenko, P. Niarchos, 6 nights),
T. Vanmunster, RIT observatory team (M. Richmond, M. Aggleton), B. Martin,
and the Kyoto data.  Thanks to all observers, the fifth rebrightnening
has been recorded in unprecedented detail!

    The most striking feature of the fifth rebrightening is the waekening
of the superhump signal around the rebrightening maximum.  It seems to be
superhumps may be fading away, but this needs to be tested by further
observations.

    The phase-averaged light curve close to the rebrightening maximum
shows a hump at phase 0.2, which siginifantly differs from the result
from preceding observations, and qualifies the signal as superhumps,
rather than some orbital signature.  Eclipses are also weakly seen,
and have a rather broad profile.

    Observers are strongly urged to follow the evolution of (super)humps,
eclipses, and the rebrightening itself, in order to further discriminate
the possibilities of the intrinsic weakening of superhumps or the beat-related
modulations.

Regards,
Taichi Kato
VSNET Collaboration team

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