Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998mnras.298..861k&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 298, Issue 3, pp. 861-870.
Astronomy and Astrophysics
Astronomy
11
Accretion, Accretion Discs, Hydrodynamics, Binaries: Close
Scientific paper
We examine the spatial stability of spherical adiabatic Bondi accretion on to a point gravitating mass against external perturbations. Both transonic critical and subsonic subcritical accretion are shown to be stable against purely radial acoustic, vortex or entropy perturbations. In the case of non-radial perturbations the amplitude of the perturbations grows without limit with smaller radii. Instability manifests itself only if the size of the accreting body is much less than the Bondi radius so that the inflow is highly supersonic or highly subsonic at the surface of the accretor in the case of critical or subcritical accretion respectively. These asymptotics hold and consequently the instability may develop for adiabatic index of accreting gas γ<5/3. We suggest that this instability may lead to an essential thermalization of accreting flow thus, particularly, solving the problem of otherwise inefficient energy release in spherical accretion on to a black hole.
Eremin M. A.
Kovalenko Ilya G.
No associations
LandOfFree
Instability of spherical accretion - I. Shock-free Bondi accretion 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 Instability of spherical accretion - I. Shock-free Bondi accretion, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Instability of spherical accretion - I. Shock-free Bondi accretion will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1535568