Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..939w&link_type=abstract
Astrophysical Journal, Part 1, vol. 235, Feb. 1, 1980, p. 939-944.
Astronomy and Astrophysics
Astrophysics
173
Binary Stars, Emission Spectra, Line Spectra, Stellar Mass Accretion, Stellar Spectra, Variable Stars, Balmer Series, Calcium, Dwarf Stars, H Lines, Novae, Potassium, Stellar Structure, Stellar Temperature
Scientific paper
The heating and radiative cooling of steady-state viscous accretion disks in close binary systems are studied. It is shown that the temperatures of the outer regions of disks do not fall below approximately 6000 K over a wide range of conditions. Depending upon the mass accretion rate, the outer parts of disks in cataclysmic variables are optically thin in the optical continuum, and radiate a line spectrum which is superposed upon the thermal continuum emitted by the inner disk. The Balmer lines and Ca II H and K emission which are observed in dwarf novae at quiescence can be explained by the emission from the optically thin outer regions of the disks; however, the He I and He II lines must be produced by a different mechanism. This theory predicts that the peak fluxes of the Balmer lines in cataclysmic variables should fall on a Planck curve of temperature of about 7000 K.
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