[vsnet-campaign-dn 1169] WZ Sge: superhump period and structure on Aug. 10-11

[Taichi Kato <tkato>]

WZ Sge: superhump period and structure on Aug. 10-11

Dear Colleagues,

    G. Masi has just provided an excellent run.  Combined with the earlier
data, and the partially analyzed Kyoto 10 data, we have updated the
superhump period as 0.057153(16) d.  On August 9 the superhumps showed
prominent 'secondary superhumps' at phase 0.4, which became even stronger
on August 10, and gradually merged into singly-peaked superhumps on
August 11.1.

    The discrimination of true superhump signal among peaks has become
even more difficult, but we have selected the first (in terms of the
chronological order) peak as genuine superhumps based on O-C analyses
(this identification may be subject to revision, as new data become
available).  There is a tendency of peak merging.  Further observations
are very strongly encouraged.

    Masi's latest data also suggests some decline of the mean magnitude.
This also needs to be confirmed by further (immediate) observations.

Regards,
Taichi Kato
VSNET Collaboration team

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