Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....109..319w&link_type=abstract
The Astronomical Journal (ISSN 0004-6256), vol. 109, no. 1669, p. 319-325
Astronomy and Astrophysics
Astronomy
6
Accretion Disks, Astronomical Models, Cataclysmic Variables, Emission Spectra, Hydrogen, Line Spectra, Chromosphere, Spectral Line Width, Steady State, Stellar Radiation, Viscosity
Scientific paper
The hydrogen line emission expected from the disks of cataclysmic variables is investigated using various accretion disk models. The thick, low viscosity, time-dependent models of Mineshige and Wood are considered first. Next, we considered a series of moderate to high viscosity, steady state alpha disk models. On top of these disk models it is assumed that there is a hot chromosphere which results from the reprocessing of boundary layer radiation. We find that the low visosity disk models are generally optically thick and the predicted line equivalent widths were much smaller than expected for dwarf novae in quiescence. Increasing the energy input into the chromosphere by a factor of 10 had a relatively small effect on line equivalent widths. The steady state alpha disk models with high viscocisity (alpha approximately equal to 10-100) seem to hold the most promise for producing the observed equivalent widths.
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