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Accretion Disk Structure in SS Cygni

Published online by Cambridge University Press:  12 April 2016

F.V. Hessman
F.V. Hessman*
Affiliation:
Max-Planck-Institut für Astronomie, Heidelberg, F.R.G.

Abstract

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High-resolution Coude observations of non-axisymmetric line emission -from the dwarf nova SS Cygni are presented. By subtracting the constant line component, the asymmetric line emission responsible for the observed phase shift between the absorption and emission line radial velocity curves can be isolated. The extra emission is a large fraction of the total line emission and extends to large velocities (~1500 km sec−1). The phase stability of the emission demands a large-scale structure which is fixed in the frame of the binary. A magnetic origin of the excitation cannot De ruled out but is implausible. A simple explanation is that the accretion stream from the companion star is able to spill over the sags of the disk, introducing emission at non-circular velocities and most likely disturbing the upper layers of the accretion disk.

Type
IV. Accretion Disks
Information
International Astronomical Union Colloquium , Volume 93: Cataclysmic Variables: Recent Multi-Frequency Observations and Theoretical Developments , 1987 , pp. 351 - 364
Copyright
Copyright © Reidel 1987

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