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[vsolj-alert 351] SS Cyg campaign

SS Cyg campaign

　SS Cygの今回の異常増光に合わせて衛星(HST,EUVE,RXTE)を使った観測キャンペー
　ンがスタートします。可視光との相関が重要です。眼視観測の報告は通常通り
　VSNET経由で取扱いますが、時間分解測光の可能な方は、以下にご連絡ください。

   Forwarded request from Chris Mauche:

Date: Fri, 4 Jun 1999 18:21:36 -0700 (PDT)
From: "Christopher W. Mauche" <mauche@cygnus.llnl.gov>
Subject: SS Cyg campaign 

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SS Cyg [RA(2000) = 21 42 42.30, Dec(2000) = +43 35 08.0] is at V~10 and is
slowly rising to an outburst which is predicted to peak on about June 9, 
start back down almost immediately, and reach quiescence on about June 20.
The Hubble Space Telescope (HST), Extreme Ultraviolet Explorer (EUVE), and 
Rossi X-ray Timing Explorer (RXTE; PI = Eric Schlegel) will observe the 
source between about June 7 and June 21. The details of the satellite obser-
vations are listed below:

1) HST observations (1st two visits pinned down, 2nd two less certain):

   4-orbit visit runs   June  8, 17:48-23:07 UT
   4-orbit visit runs   June 10, 18:10-23:43 UT
   4-orbit visit starts June 14, 14UT
   4-orbit visit starts June 18, 13UT

2) EUVE runs "continuously" from June 7 08:05 UT through June 20 14:00 UT.

3) RXTE plan is complicated and not yet scheduled, but the sequence starts on
   June 7 and ends of June 21. There will be coverage during the HST observa-
   tions and in between, but the details are not yet known.

In addition to these satellite observations, I have contacted a number of 
ground-based optical observers who may be able to obtain high-speed (~1 sec)
multicolor photometry, but the number of observers who can obtain this type of
data may be small because large telescopes (~1 meter) are required to gather 
enough light to see the low-amplitude quasi-periodic oscillations. I am
interested in involving additional optical observers in this campaign who can
obtain optical photometry (UBVRI) and/or spectroscopy, since HST will only 
cover the bandpass from 1150-2780 Angstroms. "Amateur" observers should submit
their visual magnitude estimates to either VSNET or AAVSO; the AAVSO already
has issued a News Flash (#446) and is centrally involved in this campaign.

Regards,
Chris Mauche

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| Christopher W. Mauche                     Phone: (925) 422-7017          |
| Lawrence Livermore Nat'l Lab.             Fax:   (925) 423-5998          |
| L-43, 7000 East Avenue                    e-mail: mauche@cygnus.llnl.gov |
| Livermore, CA 94550                               mauche@llnl.gov        |
|--------------------------------------------------------------------------|
|           www: http://vsnet-phys.llnl.gov/V_Div/profiles/Mauche/           |
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