[vsnet-preprint 87] 1996 outburst in GK Per

[Daisaku NOGAMI <nogami@kwasan.kyoto-u.ac.jp>]

Dear colleagues,

We have summarized our observations during the 1996 outburst
in GK Per in a paper, which will appear in PASJ, vol. 54, No. 6
(December issue).  The preprint files are now available via
VSNET preprint archives,
http://vsnet.kusastro.kyoto-u.ac.jp/pub/vsnet/preprints/GK_Per/ .
Please enjoy it!

Best regards,
Daisaku Nogami
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Title: Time-Resolved Photometry of GK Per during the 1996 Outburst
Author: D. Nogami, T. Kato (Kyoto Univ.), H. Baba (ISAS)
Abstract:
GK Per is a unique cataclysmic variable star which has showed a nova
explosion as well as dwarf nova-type outbursts, and has the
intermediate-polar nature.  We carried out $V$-band time-resolved
photometry and $B$-band monitoring during the 1996 outburst.  This
outburst lasted about 60 d and is divided into three parts: the slow
rise branch for 35 d, the gradual decay branch with a decay rate of 20.0
d mag$^{-1}$ for $\sim$16 d, and the rapid decline branch with a rate of
5.6 d mag$^{-1}$ for $\sim$10 d.  The $B-V$ color became bluest
($B-V\sim0.18$) about 10 d before the outburst maximum, which supports
an idea that the outburst in GK Per is of the inside-out type.  The spin
pulse, $440$-s quasi periodic oscillations (QPOs), and $\sim$5,000-s
QPOs were detected in our light curve, as previously seen in X-ray and
optical observations.  In addition, we report the discovery of
$\sim$300-s periodicity, which is shorter than the spin period.

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