[vsnet-alert 498] rare outburst of V1028 Cyg

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

   V1028 Cyg (SU UMa-type dwarf nova) is reported to be undergoing a rare
outburst as indicated by the following observations extracted from vsnet-obs
reports.

1996 Aug. 5.051   <15.6  M. Biesmans
          5.984   <15.1  M. Biesmans
          7.048   <15.6  M. Biesmans
          7.899    13.6  M. Biesmans
          7.90     14.0  J. Pietz

   The last reported outburst of V1028 Cyg occurred on 1995 July 28
(cf. vsnet-alert #166, 168).  The discovery of superhumps during that
outburst led to the present classification of this dwarf nova.
Below is an extract from vsnet-alert #175, whose stress on the importance
of detailed observations also applies to the present outburst.

> From the current (1995 July - Aug.) 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
> (i.e. longer period superhumps) is not still understood.

Regards,
Taichi Kato

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