[vsnet-campaign-dn 1460] WZ Sge: modulation at the sixth rebrightening

[Taichi Kato <tkato>]

WZ Sge: modulation at the sixth rebrightening

Dear Colleagues,

   We have completed the analysis of the Kyoto Aug. 31 data (observer
Ishioka, Uemura et al.)  The mean brightness of the object remained almost
constant until the end of the run (31.775 UT), with prominent humps and
eclipses.

   Deep, sharp eclipses are also clearly present in Starkey's Sep. 1 data,
which were taken at or just after the rebrightening maximum.  The hump
maxima, with a smaller amplitude, are seen at a phase close to that observed
in the preceding Kyoto data.  The clear appearance of eclipses and humps
at the sixth rebrightening maximum (these features were not very clear
during the fifth rebrightening) may suggest the presence of a precessing
component (origin of superhumps?), which is eclipsed at certain times.
Aug. 23 data showed similar eclipse and pre-eclipse humps, which may suggest
the presence of a 8-d cycle.

Regards,
Taichi Kato
VSNET Collaboration team

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