[vsnet-campaign 864] V550 Cyg possible outburst

[Taichi Kato <tkato>]

V550 Cyg possible outburst

   The SU UMa-type dwarf nova V550 Cyg may be in outburst, as reported
by Gary Poyner.

  YYYYMMDD(UT)   mag  observer
  20010420.046  <145  (M. Reszelski)
  20010421.113   140  (G. Poyner)

   The last (and first visually detected) outburst of V550 Cyg occurred in
2000 August (mv=14.8, Timo Kinnunen), which turned out to be a superoutburst.

[vsnet-alert 5191]

>    As reported by Timo Kunninen, the poorly studied dwarf nova V550 Cyg
> is undergoing an outburst.
> 
>   YYYYMMDD(UT)   mag  observer
>   20000817.860   153: (T. Kinnunen)
>   20000819.870   148  (T. Kinnunen)
>   20000819.912   148  (T. Kinnunen)
> 
>    This is the first reported outburst to VSNET.  Although past observations
> were rather sparse, this may suggest a rare outburst.
> 
>    We propose this star as the potential VSNET campaign target.  Time-resolved
> photometry, astrometry and other observations are strongly encouraged.

[vsnet-alert 5196]

> Dear Colleagues,
> 
>    From the time-series observation last night, clear superhumps with an
> amplitude of ~0.3 mag were detected.  Although the reduction is preliminary,
> the inferred period of 0.061 d would place V550 Cyg as one of short-period
> SU UMa-type dwarf novae.  Follow-up observations are strongly encouraged
> to precisely determine the superhump period.  Let's join the VSNET
> Collaboration! and report your progress timely to vsnet-campaign-dn or
> vsnet-campaign (when a new announcement is necessary).
> 
> Regards,
> H. Iwamatsu and T. Kato
> VSNET Collaboration team

   If the present possible (bright!) outburst turns out to be a superoutburst,
the supercycle of V550 Cyg would be ~240 d.  Confirmatory observations
and follow-up observations are strongly encouraged.

Regards,
VSNET Collaboration team

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