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Spectroscopic classification of two Galactic variables

ATel #4519; L. Tomasella, S. Benetti, E. Cappellaro, A. Pastorello, M. Turatto (Osservatorio Astronomico di Padova, Istituto Nazionale di Astrofisica)
on 26 Oct 2012; 08:04 UT
Distributed as an Instant Email Notice Transients
Credential Certification: Stefano Benetti (stefano.benetti@oapd.inaf.it)

Subjects: Optical, Cataclysmic Variable, Transient

We report that a spectrogram of PSN J02010888+5048156 obtained on Oct. 22.88 UT with the Asiago 1.82-m Copernico Telescope (+ AFOSC; range 350-820 nm; resolution 1.3 nm), shows that this object is not a supernova but most likely a CV variable. The spectrum is characterized by a strong blue continuum and narrow Halpha, Hbeta and Hgamma emissions at rest wavelength. The Balmer decrement in the emission components, with the presence of a fairly strong Halpha and higher members of the series showing progressively stronger absorptions, confirms the classification as a dwarf nova. Also the He I emission at 587.6 nm is clearly visible. We also report that a spectrogram of PSN J06040140+4825089 obtained on Oct. 23.10 UT as above, reveals Balmer emission lines at rest wavelenght and a continuum that raises very strongly to the short-ward. The presence of absorption dips surrounding Hbeta is typically evident in dwarf novae as the result of the presence of the accretion disk following outburts (Szkody et al. 1990 ApJS 73, 441)