Thermal Instability of Advection-Dominated Disks against Revised Local Perturbations

Details Thermal Instability of Advection-Dominated Disks against Revised Local Perturbations Thermal Instability of Advection-Dominated Disks against Revised Local Perturbations

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997pasj...49..221k&link_type=abstract

Publications of the Astronomical Society of Japan, v.49, p.221-225.

Astronomy and Astrophysics

Astronomy

21

Accretion, Accretion Disks, Instabilities, Thermal

Scientific paper

The thermal stability of advection-dominated accretion disks against local perturbations is re-examined in order to correct some errors in our previous paper. Thermal perturbations which are local in the radial direction are found to also be local in the vertical direction. Because of this, the using of vertically integrated quantities was irrelevant in analyzing the stability of local thermal perturbations when the disks are geometrically thick. Our new results, obtained by correcting the error, show that if the turbulence acts as a diffusion process in thermal energy transport, it strongly dampens the thermal perturbations. In these cases when the diffusion process is weak, however, perturbations grow due to a variation of the viscous heating associated with the perturbations. One such example of growth is in the case where radiation pressure greatly dominates the gas pressure.

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