Electronic Telegram No. 2283
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  Daniel W. E. Green; Room 209; Dept. of Earth and Planetary
 Sciences; Harvard University; 20 Oxford St.; Cambridge, MA  02138; U.S.A.
e-mail:  cbat@iau.org; cbatiau@eps.harvard.edu
URL http://www.cfa.harvard.edu/iau/cbat.html


CATACLYSMIC VARIABLE IN PEGASUS
     G. Tovmassian, D. Clark, and S. Zharikov, Instituto de Astronomia,
Universidad Nacional Autonoma de Mexico, conducted 2.5 hours of
spectrophotometry of the object announced on CBET 2273 (see also CBETs
2275 and 2277) -- starting on May 10.4 UT, with the 2.1-m telescope (+
Boller & Chivens spectrograph; 1200 lines/mm grating; resolution FWHM 0.13
nm, range 370-500 nm).  The spectra show broad absorption lines of H and He,
with small central emission in the cores of the lines, typical of the
spectra of dwarf novae at the plateau of outburst.  The central emission
peak increases in strength towards H_beta of the Balmer series but is
strongest in the He II line.  The Bowen complex of N III, C III, and C IV
is also visible in emission.  Measurements of radial velocities of the
lines confirm the binary nature of the object.  The period determination is
very rough at 82 +/- 5 minutes, based on only 25 spectra obtained with 60-s
exposure times and covering continuously about one full orbital period.
The deduced period confirms the dwarf-nova nature of the object and argues
strongly in favor of a WZ Sge classification -- as such objects are known
to undergo super-outbursts with amplitude of approximately 8 magnitudes.


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
      superseded by text appearing later in the printed IAU Circulars.

                         (C) Copyright 2010 CBAT
2010 May 15                      (CBET 2283)              Daniel W. E. Green