[vsnet-campaign 999] tom marsh: EM Cyg observations

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

    We have received the following e-mail from Dr. Marsh.
They schedule HST observations on EM Cyg and call for a campaign.

Regards,
Makoto Uemura
VSNET administrator team

------- Forwarded Message
Date: Mon, 16 Jul 2001 12:12:45 +0100 (BST)
From: tom marsh <trm@astro.soton.ac.uk>
To: vsnet-adm@kusastro.kyoto-u.ac.jp
Subject: EM Cyg observations


Dear Observers,

I have observations of the dwarf nova EM Cyg with the Hubble Space
Telescope which are currently scheduled to occur in the period 23 - 29 July,
with the most likely time being 12:22 - 13:10 UT on July 29. The
observations will be made with the Fine Guidance Sensor (FGS) with the
purpose of resolving the EM Cyg binary from a third star known to
contaminate optical spectra of EM Cyg (North et al 2000). Depending upon
how close this star is to EM Cyg, useful constraints can be placed upon
the evolution of EM Cyg prior to its becoming a cataclysmic variable. The
resolution of the FGS depends upon the magnitude difference between EM Cyg
and the third star, thus it would be useful to know how bright EM Cyg
is at the time of the HST observations. Therefore I would like to ask
observers whether they can take a look at EM Cyg, especially around
12-13:00 UT on July 29.

thank you in advance for your efforts,

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.
- ---------------------------------------------------------------






------- End of Forwarded Message

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