[vsnet-alert 6245] WZ Sge: August 9

[Taichi Kato <tkato>]

WZ Sge: August 9

Dear Colleagues,

   We have receieved the high-quality set of the latest data from G. Masi.
Together with the partially analyzed Kyoto data on Aug. 9, we have refined
the superhump period as 0.057171(17) d.

   The residuals to this ephemeris a systematic variation, with a likely
period of 4 d.  This variation is most likely caused by the beat between
the orbital and superhump periods.  As noted by G. Masi, the superhumps
show 'secondary superhumps' at phase 0.4 in the August 9 observations.
On the contrary to Masi's suggestion, the O-C analysis favors the main
peak as genuine superhumps.  The secondary superhumps were already present
in the earlier Kyoto observations, but had a smaller amplitude.  The
phases of these secondary superhumps do not seem to vary very significantly,
pending immediate more observations.  This feature seems to more resemble
secondary superhumps sometimes seen in other SU UMa-type dwarf novae,
but whose nature is still poorly understood.

   Please follow the evolution of superhumps as much as you can, and as
follow the fate of secondary superhumps as quickly as possible!

Regards,
Taichi Kato
VSNET Collaboration team

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