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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 (lina.tomasella@oapd.inaf.it)

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 (http://crts.caltech.edu). 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