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Astron. Astrophys. 337, 311-320 (1998)

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Numerical computation of two dimensional wind accretion of isothermal gas

Eiji Shima 1, Takuya Matsuda 2, Ulrich Anzer 3, Gerhard Börner 3 and Henri M.J. Boffin 4

1 Kawasaki Heavy Industries, Kakamigahara, Gifu, Japan
2 Department of Earth and Planetary Science, Kobe University, Kobe 657, Japan
3 Max-Planck Institut für Astrophysik, Postfach 1523, D-85740 Garching, Germany
4 Department of Physics and Astronomy, University of Wales, Cardiff CF2 3YB, UK

Received 21 April 1998 / Accepted 22 June 1998


A new numerical algorithm for calculating isothermal wind accretion flows has been developed and is applied here to the analysis of the hydrodynamics of two-dimensional plane symmetric accretion flows in wind-fed sources. Polar coordinates are used to ensure fine resolution near the object. It is found that a thin accretion column is formed which shows wave-like oscillations. Small accretion disks are formed temporarily around the object. Mass accretion rate and angular momentum accretion rate exhibit quasi-periodic oscillations. The amplitudes of the oscillations depend on the size of the inner boundary, the number of grid points and the method of calculation. For a smaller size of the inner boundary, finer grids and more accurate numerical schemes, the amplitudes of the oscillation become larger.

Key words: accretion, accretion disks – hydrodynamics – instabilities – shock waves – methods: laboratory – stars: pulsars: general

Send offprint requests to: U. Anzer

© European Southern Observatory (ESO) 1998

Online publication: August 6, 1998