[vsnet-alert 175] V1028 Cyg: fully grown superhumps

[Taichi Kato <SDI00707@niftyserve.or.jp>]

   CCD photometry at Ouda Station (Kyoto University) shows that The super-
humps of V1028 Cyg now seem to have fully grown.  The light curve shows
characteristic triangular superhumps with an amplitude of 0.29 mag in V.
A period analysis on July 31 data shows a strong signal at 0.063 day.
An analysis of the merged data of July 30 and 31 also shows a strong
peridicity at 0.0626 day (and much less likely one-day alias 0.0670 day).
From the current observations, we may now adopt 0.0626 day as a superhump
period of V1028 Cyg.  This short superhump period can be comparable to
those of T Leo, VY Aqr and AQ Eri, all of which show relatively infrequent
(super)outburst activity.  The low outburst frequency of V1028 Cyg seems
to consistent with what is expected from the observed superhump period.
Both T Leo and VY Aqr are known to show "double maxima", so close monitoring
of V1028 Cyg even after the end of present superoutburst is recommended.
The origin of discordant period observed at the earliest stage of outburst
is not still understood.

Regards,
Taichi Kato & Ouda team

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