[vsnet-campaign-dn 1310] WZ Sge: superhump period analysis

[Taichi Kato <tkato>]

WZ Sge: superhump period analysis

Dear Colleagues,

   S. Kiyota-san has sent the latest set of observations.  The rising trend
is less marked in this observation.  We need to closely observe whether
there is hours-to-day modulations (observed in AL Com in the past), or
there is a steadily rising trend.

   The more detailed timing analysis of newly appeared superhumps have shown
that these hump maxima are well represented by a period of 0.05681 d, which
is consistent with the PDM analysis from the earlier data.  The hump
timings have O-C's (aboslute values) less than 0.002 d for at least the
latest 35 cycles.  Such a high degree of stability of the superhump period
was not observed during the main superoutburst; it may be either the
beat phenomenon has become weak, or we are observing a stable segment
of new superhumps by chance.  The rapid growth of new superhumps was
observed during the Aug. 18 full-night Kyoto run, and the amplitude became
full (0.3-0.4 mag) on late Aug. 18 (UT), which was closely followed by
M. Moilanen and A. Oksanen (Nyrola Observatory team), J. Pietz, G. Masi
and B. Martin.  The coherence of superhumps was confirmed up to the
latest run by Kiyota-san.

   Further observations are strongly wanted, since eclipses are expecteded
to coincide with the superhump maxima.

Regards,
Taichi Kato
VSNET Collaboration team

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