[vsnet-campaign 704] V344 Ori: strange modulations

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

Dear colleagues,

    Combined with time-series observations which were kindly sent 
by Nyrola team and B. Martin and ours, the light curve of V344 Ori 
on January 16 -- 19 shows gradual decline with a rate of 0.08mag/day 
which is reminiscent of a plateau stage during a superoutburst.  
The humps, which I previously mentioned in [vsnet-alert 5569], 
are however not similar to ordinary superhumps as reported by 
T. Vanmusnter in [vsnet-alert 5574]. 

    Their amplitudes are highly variable and irregular between ~0.02 
and ~0.1 mag, but their peaks seem to appear rather periodically. 
Our PDM analysis yields candidates of the period of ~0.04 day, 
with which we see an average light curve with single peak, and 
~0.12 day, with multiple peaks.  If 0.04d is a superhump period, 
it is well below the "minimum period" of hydrogen-rich cataclysmic 
variables.

    Follow-up time-series observations are urgently needed to 
determine whether these modulations are due to superhumps or 
a kind of quasi-periodic oscillations, or another.
We will keep nightly time-series photometry for 9 hours during 
this outburst in fine nights.
 
Regards,
Makoto Uemura, Taichi Kato and Ryoko Ishioka

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