Structure of the pre-outburst accretion disk in SS Cygni

Details Structure of the pre-outburst accretion disk in SS Cygni Structure of the pre-outburst accretion disk in SS Cygni

Feb 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012a%26a...538a..94k&link_type=abstract

Astronomy & Astrophysics, Volume 538, id.A94

Astronomy and Astrophysics

Astrophysics

Techniques: Spectroscopic, Accretion, Accretion Disks, Stars: Dwarf Novae, Stars: Individual: Ss Cygni, Novae, Cataclysmic Variables

Scientific paper

We present results of spectroscopic observations of SS Cygni performed at the 1.5 m telescope of the Loiano Observatory in June 2009, three days before a long outburst. Using results of these observations, we computed Doppler tomograms in three Balmer lines Hβ, Hγ, and Hδ. Analyzing the tomograms, we identified gas dynamic features existing in the system. It is shown that in the pre-outburst disk a number of shock waves exist. These waves are "hot line" a wave produced by the interaction between the circum-disk halo and the stream from the inner Lagrangian point L1, and two arms of the spiral tidal shock and bow shock caused by the motion of the accretor and disk in the gas of the circum-binary envelope. We also found that before the outburst the density and size of the disk increase.

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