Electronic Telegram No. 692
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
M.S. 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
CBAT@CFA.HARVARD.EDU (science)
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DWARF NOVA IN AQUARIUS
     J. Prieto, Ohio State University (OSU); S. Anderson and A. Becker,
University of Washington; J. Marriner, Fermilab; M. Sako, University
of Pennsylvania; and S. Jha, Kavli Institute for Particle Astrophysics
and Cosmology, Stanford Linear Accelerator Center -- on behalf of the
SDSS Supernova Survey collaboration (cf. CBET 680) -- reports the
discovery of a Galactic hydrogen-deficient dwarf nova, likely a new
member of the rare "AM CVn" class.  The object, located at R.A. =
20h47m39s.40, Decl. = +0o08'40".3 (equinox 2000.0), was discovered at
magnitude r = 17.8 using the SDSS 2.5-m telescope at Apache Point
Observatory on Oct. 12 UT.  The variable star appeared to fade to r =
20.8 on Oct. 14 (observed under poor conditions) but re-brightened to
r = 18.3 on Oct. 18 and 20, and has faded again to r = 20.8 on Oct. 22.
A spectrum of the object, taken on Oct. 19.08 UT with the MDM 2.4-m
Hiltner telescope (+ OSU Boller and Chivens Spectrograph), shows a
blue continuum with shallow absorption lines of He I at 382.0, 386.7,
392.7, 400.9, 402.5, 414.4, 438.8, 447.1, 492.2, and 587.6 nm with zero
radial velocity.  The spectrum is similar to those of KL Dra (= 1998di;
Jha et al. 1998, IAUC 6983) and 2003aw (Chornock and Filippenko 2003,
IAUC 8084).


NOTE: These 'Central Bureau Electronic Telegrams' are sometimes
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                         (C) Copyright 2006 CBAT
2006 October 25                  (CBET 692)               Daniel W. E. Green