SDSS J124819.36+072049.4 is a Dwarf Nova
ATel #481; R. Quimby, M. Sellers, P. Mondol, P. Hoeflich, J. C. Wheeler (University of Texas), and C. Gerardy (Imperial College)
on 5 May 2005; 17:14 UT
Credential Certification: Robert Quimby (quimby@astro.as.utexas.edu)
Subjects: Optical, Cataclysmic Variable, Transient
Referred to by ATel #: 3879
We report the
discovery of a dwarf nova in unfiltered CCD images taken on Apr 26.25
UT (about 16.7 mag) and Apr 28.20 (about 17.0 mag) using the 0.45m
ROTSE-IIIb telescope at the McDonald Observatory. The object is
located at RA = 12h48m19.38s DEC = +07o20'48.8" and was not detected
in ROTSE-IIIb data from Apr 20.20 UT (limiting mag about 17.0). The
object was observed by the Sloan Digital Sky Survey in quiescence
(SDSS J124819.36+072049.4) at r'=21.50 mag. A spectrum (420-890 nm) of
the object obtained on Apr 29.13 with the 9.2m Hobby*Eberly Telescope
(+ Marcario Low-Resolution Spectrograph) by S. C. Odewahn and
M. Villarreal, shows doubly peaked H-alpha emission, along with
absorption lines from H-beta, H-gamma, HeI 447.1 nm and 587.6 nm, and NaI 589 nm. ROTSE-IIIb data shows the object faded to
about 17.7 magnitude on May 1.14 UT.
