Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...239..399a&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 239, no. 1-2, Nov. 1990, p. 399-403. Research supported by the Technion - Isra
Astronomy and Astrophysics
Astrophysics
3
Accretion Disks, Energy Dissipation, Mass Transfer, Radiative Transfer, Gravitational Fields, Spatial Distribution
Scientific paper
The local linear stability of thick accretion disks is studied, including viscous and radiative diffusion terms. It is shown that the method described by Abramowicz et al. (1986) can be used to obtain the entire set of dispersion relations for local, axisymmetric perturbations of thick accretion disks. The Hoiland, Schwarzschild, and Solberg criteria for dynamical stability are obtained along with unstable modes driven by viscosity which can be stabilized only if the fluid is barotropic or by the radial inflow. Modes driven by an unstable entropy gradient for which the rate of growth is determined by viscosity are found, as are modes occurring in the presence of unstable entropy or angular momentum gradients, which can be either stabilized or destabilized by the competition between viscous heat generation and radiative losses.
Abramowicz Marek A.
Livio Mario
Soker Noam
Szuszkiewicz Ewa
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