[vsnet-campaign 1097] (fwd) Late superhumps in WZ Sge

[Taichi Kato <tkato>]

Date: Wed, 15 Aug 2001 09:29:45 +0100 (BST)
From: tom marsh <trm@astro.soton.ac.uk>
Subject: [vsnet 2108] Late superhumps in WZ Sge

Dear Observers,

its now the 22nd day of the WZ Sge outburst and quiescence
must be coming soon. However rather than think its all over then,
I wanted to encourage everyone looking at this star to carry on
intensively now and well after the outburst because of an interesting
paper by Rick Hessman and others on the dwarf nova OY Car. (Hessman et al
1992, Astronomy & Astrophysics, 263, 147). In this paper they observed
eclipses of the bright spot where the gas stream hits the disk after a
superoutburst. This can be used to determine the radius at which the
stream/disk impact occurs. This revealed that an elliptical disk
remained even after the outburst. This disk precesses slowly relative to
our line of sight and so varying radii are measured for the stream impact.
We might be able to do the same for WZ Sge. It just requires
as-fast-as-possible photometry in the lates stages and following the
outburst (less than 1 minute exposure to exposure, preferably less than 30
seconds). If the superb coverage obtained so far keeps up, it may be
possible to map out the shape of the disk in exquisite detail, which
would be a nice finale to a great campaign,

regards,

Tom Marsh
---------------------------------------------------------------
Dr T.R. Marsh;  Tel: (44)-23-8059-2063;  FAX: (44)-23-8059-3910
See http://vsnet.astro.soton.ac.uk/~trm/ for more information.
---------------------------------------------------------------

VSNET Home Page

---

vsnet-adm@kusastro.kyoto-u.ac.jp

VSNET Home Page

Return to Daisaku Nogami

---

vsnet-adm@kusastro.kyoto-u.ac.jp