[vsnet-campaign-nova 219] V445 Pup short-term variation

[Makoto Uemura <uemura@kusastro.kyoto-u.ac.jp>]

V445 Pup short-term variation

    The VSNET V445 Pup collaboration team has received multi-color 
and/or time-series photometry taken by A. Retter, G. Handler, and 
M. Martigoni (Thanks very much!).

    Combined with the Kyoto observations on February 10 - 19, 
the data shows short-term modulations with a time-scale from ten minutes 
to an hour, and longer scale (a few days) variations which are also 
reported by visual observers.  No promising periodicity of both variations 
can be detected, however we can see weak signals around 0.022, 0.032, 0.045 
day in I- and V-bands.  Amplitudes of the short-term modulations 
are variable, but typicaly 0.03mag in V-band and 0.01-0.02mag in B-band. 
The object seems to be show both "flare" and "dip", but due to the strong 
activity of the source, it is difficult to determine the base level. 

    More CCD time-series photometry is apparently needed.  

Regards,
Makoto Uemura
on behalf of VSNET collaboration team

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