The sizes and edge temperatures of optically thick accretion discs

Details The sizes and edge temperatures of optically thick accretion discs The sizes and edge temperatures of optically thick accretion discs

Aug 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981mnras.196..507f&link_type=abstract

Monthly Notices of the Royal Astronomical Society, vol. 196, Aug. 1981, p. 507-515.

Astronomy and Astrophysics

Astronomy

12

Binary Stars, Disks (Shapes), Opacity, Stellar Mass Accretion, Stellar Temperature, Variable Stars, Approximation, Black Holes (Astronomy), Emission Spectra, Line Spectra, Optical Thickness, Radii, Stellar Spectra, X Ray Sources

Scientific paper

A simple treatment is presented of the opacity of steady accretion disks. The approximations involved are such that the stated results for edge temperature and disk radius may hold after the development of a more complete disk viscosity theory. It is shown that the edge temperature may commonly be about 4000 K or even less in some cases, and that in the absence of truncation by other means, such as tidal effects, the size of the optically thick region will so greatly increase at outburst that the low excitation emission lines from the previously optically thin regions will be made to disappear or go into absorption. In addition, the edge temperature may vary significantly with small changes in accretion rate in some regimes.

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