Asiago spectroscopic observation of two CRTS transients
ATel #6513; L. Tomasella, S. Benetti, E. Cappellaro, N. Elias-Rosa, P. Ochner, A. Pastorello, M. Turatto (INAF Osservatorio Astronomico di Padova)
on 29 Sep 2014; 13:25 UT
Credential Certification: Lina Tomasella (firstname.lastname@example.org)
Subjects: Optical, Nova, Variables
The Asiago Transient Classification Program (Tomasella et al. 2014, AN, 335, 841)
reports the spectroscopic observation of two targets supplied by the Catalina Real-Time Transient Survey CRTS
The observation was performed with the Asiago 1.82 m Copernico Telescope
(+AFOSC; range 340-820 nm; resolution 1.3 nm).
The spectrum of CSS140925:001916+154520 shows a typical feature of a dwarf nova following outburst and an indication of a thick accretion disk, i.e. broad absorption around a central emission core of Balmer lines and HeI 4471 A, superimposed on a blue continuum. A pretty strong absorption feature of Na D is also detected.
A low S/N spectrum of CSS140920:013632+202818 reveals a red spectral energy distribution, with an almost featureless continuum. Only Na D and Mg I b absorptions are clearly detected. We do not detect Halpha, in absorption or in emission, but we cannot rule out low-level emission either. On the other hand, Hbeta seems to show a central emission core in a broad absorption.
Padova Asiago SN group