[vsnet-campaign 1140] WZ Sge: new hump structure and possible QPOs

[Taichi Kato <tkato>]

WZ Sge: new hump structure and possible QPOs

Dear Colleagues,

   The analysis of the latest data (J. Pietz and A. Oksanen) has revealed
the emergence of new (super)humps at phases completely different from
the previous superhumps (during the second rebrightening).  This phenomenon
may be some sort of "late superhumps" to newly appeared superhumps during
the second rebrightening (how complex!).  There seem to be no "true" eclipse
signals.

   Furthermore, large-amplitude modulations with time-scales of ~20 min.
Although they may be substuctures of (super)hump signals, they may represent
the emergence of new QPOs.  Since some super-QPOs are known to arise from
these slow modulations (cf. EF Peg in 1991), observers are strongly urged
to record the evolution of short-term oscillations, as well as evolution
of (super)humps.

Regards,
Taichi Kato
VSNET Collaboration team

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