Query : 2012A&A...538A..94K

2012A&A...538A..94K - Astronomy and Astrophysics, volume 538A, 94-94 (2012/2-1)

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


Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): techniques: spectroscopic - accretion, accretion disks - stars: dwarf novae - stars: individual: SS Cygni - novae, variables cataclysmic

Simbad objects: 2

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Number of rows : 2
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
1 V* EM Cyg CV* 19 38 40.1105232999 +30 30 28.313972620     11.90     ~ 243 0
2 V* SS Cyg CV* 21 42 42.8034554117 +43 35 09.863763484 11.07 8.2 7.70     K5V 1235 1

    Equat.    Gal    SGal    Ecl

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