Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976mnras.177...65p&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 177, Oct. 1976, p. 65-71.
Astronomy and Astrophysics
Astronomy
116
Astronomical Models, Deposition, Radiative Transfer, Thermal Instability, Bremsstrahlung, Electron Scattering, Perturbation Theory, Radiation Pressure, Spectrum Analysis, X Ray Stars
Scientific paper
A general criterion for thermal instability of an accretion disk is developed, taking into account the effect of radiative transfer in the radial direction. The criterion is applied to a 'standard' model of an accretion disk, and the results are found to be in full agreement with the stability analysis of Shakura and Sunyaev (1976). It is shown that when the dominant opacity is not electron scattering, the standard accretion disk is thermally stable even in the case where radiation pressure provides the dominant opacity. Application of the stability criterion to the two-temperature disk model of Shapiro et al. (1976) indicates that this model is thermally unstable. Nonaxisymmetric perturbations of the standard accretion disk are briefly considered.
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