Spectroscopy of CSS080924:233423+391423: A likely dwarf nova
ATel #1750; R. Quimby, A. Rau, E. Ofek, M. Kasliwal, A. Mahabal, A. J. Drake (Caltech), M. Kiewe (Weizmann Inst.)
on 1 Oct 2008; 01:06 UT
Credential Certification: Robert Quimby (quimby@astro.as.utexas.edu)
Subjects: Optical, Cataclysmic Variable, Transient
We observed the flaring optical transient, CSS080924:233423+391423,
discovered by CRTS (ATel #1741), with the Double Beam Spectrograph on
the 5-m Palomar Hale Telescope on Sep. 29.16 UT. The spectra (340-1000
nm) reveal numerous emission lines at zero redshift including
H-Balmer, HeI, HeII, and CaII H&K features. These features are typical
of Galactic dwarf novae. The FWHM measured from the Balmer lines is
about 900 km/s. The photometric variations found by CRTS could
indicate superhumps from a SU Uma like superoutburst, although the 1.6
mag variations on 10 minute time scales noted at discovery are perhaps
atypically large.
