On the 'flip-flop' instability of Bondi-Hoyle accretion flows

Statistics – Computation

Scientific paper

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Black Holes (Astronomy), Computational Astrophysics, Neutron Stars, Stellar Mass Accretion, X Ray Binaries, Accretion Disks, Angular Momentum, Hydrodynamic Equations, Massive Stars, Stellar Oscillations

Scientific paper

A simple physical interpretation is advanced by means of an analysis of the shock cone in the accretion flows past a compact object and with an examination of the accretion-line stability analyses. The stability of the conical shock is examined against small angular deflections with attention given to several simplifying assumptions. A line instability is identified in the Bondi-Hoyle accretion flows that leads to the formation of a large opening-angle shock. When the opening angle becomes large the instability becomes irregular oscillation. The analytical methodology is compared to previous numerical configurations that demonstrate different shock morphologies. The Bondi-Hoyle accretion onto a compact object is concluded to generate a range of nonlinear instabilities in both homogeneous and inhomogeneous cases with a quasiperiodic oscillation in the linear regime.

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