[vsnet-alert 7600] GZ Cnc: unusual? oscillations

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

GZ Cnc: unusual? oscillations

Dear Colleagues,

   GZ Cnc was observed by the Okayama U. of Sci. team, led by Tanabe-san
on December 27 (1 d after the outburst detection).

   There was no general fading trend, indicating that the rapid fading
inferred from visual observations should have stopped by then.

   The most notheworthy feature is the presen of high-amplitude quasi-coherent
oscillations (0.1-0.3 mag), which have a typical recurrent time of 20-30 min.
The amplitudes of the oscillations seem to have increased during the
observation, and the longer wave became more prominent.  The light curve is
totally unlike those taken during the 2000 outburst (Kato et al. 2001,
IBVS 5123).

   Although the nature of the oscillations is still unclear, they may be
a some harmonic of devoloping superhumps.  Further observations, especially
if the object is still in outburst, are strongly encouraged!

Regards,
Taichi Kato
VSNET Collaboration team

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