Variability of accretion discs around compact objects

Details Variability of accretion discs around compact objects Variability of accretion discs around compact objects

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...249..574l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 249, no. 2, Sept. 1991, p. 574-580.

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Computation

30

Accretion Disks, Active Galactic Nuclei, Variability, X Ray Binaries, Black Holes (Astronomy), Computational Astrophysics, Evolution (Development), Optical Thickness, Stellar Luminosity, Stellar Mass Accretion

Scientific paper

The paper concentrates on a theory suggesting that nonlocal effects can stabilize an optically thick and geometrically thin accretion disk in the regime where it is locally unstable. Attention is focused on a case in which viscous stresses are proportional to the total pressure. It is shown that although the nonlocal effects employed in the theory are important for the time evolution of the disk, they are not sufficient to suppress the instability predicted by a local analysis. It is demonstrated that in the (locally) thermally unstable regime, the inner regions of a disk always become effectively optically thin, and that the evolution and disk structure depend on the treatment of the transitions between optically thick and optically thin configurations.

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