Thermal Instability of Advection-Dominated Disks against Local Perturbations

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

1995-10-17

arxiv.org/abs/astro-ph/9510084v1

Astronomy and Astrophysics

Astrophysics

PASJ, in press 1996, Feb; uuencoded, compressed, PS file; also available on WWW at http://fy.chalmers.se/~chen/

Scientific paper

Thermal instability is examined for advection-dominated one-temperature accretion disks. We consider axisymmetric perturbations with short wavelength in the radial direction. The viscosity is assumed to be sufficiently small for the vertical hydrostatic balance to hold in perturbed states. The type of viscosity is given either by the $\alpha$-viscosity or by a diffusion-type stress tensor. Optically thick disks are found to be in general more unstable than optically thin ones. When the thermal diffusion is present, the optically thin disks become stable, but the optically thick disks are still unstable. The instability of the advection-dominated disks is different from that of the geometrically thin disks without advection. In the case of no advection, the thermal mode behaves under no appreciable surface density change. In the case of advection-dominated disks, however, the thermal mode occurs with no appreciable pressure change (compared with the density change), when local perturbations are considered. The variations of angular momentum and of surface density associated with the perturbations lead to a thermal instability. The astrophysical implications of this instability are briefly discussed.

Affiliated with

Also associated with

No associations

Rating

Thermal Instability of Advection-Dominated Disks against Local Perturbations does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Thermal Instability of Advection-Dominated Disks against Local Perturbations, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Thermal Instability of Advection-Dominated Disks against Local Perturbations will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-725187