An investigation of the stability of the Bondi-Hoyle model of accretion flow

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Models, Stellar Mass Accretion, Comets, Galactic Evolution, Gravitational Effects, Perturbation Theory, Planetary Evolution, Stagnation Point, Steady State, Stellar Evolution, Stellar Models

Scientific paper

The Bondi-Hoyle-Lyttleton (1944) accretion model is considered which involves accretion onto a massive body moving at a high Mach number with respect to the ambient medium and the production of a high-density accretion column along the axis where particle orbits intersect. The stability of steady-state solutions with respect to short-wavelength perturbations is analyzed using the WKB approximation, and the accretion column is shown to be unstable toward such perturbations. It is noted that this instability is not affected by the position of the stagnation point in the steady-state solution.

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