[vsnet-alert 6957] HT Cam: very strong modulation!!

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

HT Cam: very strong modulation!!

Dear Colleagues,

   We have partly analyzed the Kyoto and RIKEN (Torii-san) data.
The initial result is surprizing.

   Superimposed on the decay, as inferred from visual and other observations,
there exist *very strong* (0.4 mag or even larger) short-term modulations.
Although exact identification requires further analysis (of the full-night
data) and period analysis, the modulations seem to be somehow related to
the 8.5-min period reported by Tovmassian.  This finding may be indicative
of the (possibly transient) IP (intermediate polar) nature of this object.
[Note, however, optical photometry during an outburst of DO Dra, did show
a similar (lower amplitude) periodicity which does not agree with the
spin period].

   The large-amplitude short-term modulations are quite unlike any modulations
seen during an outburst of any CV.  The characteristics are even drastically
different from that reportd by Gary W. Billings (vsnet-alert 6953)
less than 0.5 d ago!  Observers are strongly requested to continue
observing this object as intensively as possible, since we may have
witnessed a short period of unexpectedly intensive avtivity of this CV.

Regards,
Taichi Kato
VSNET Collaboration team

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