Statistics – Computation
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987ap%26ss.131..591h&link_type=abstract
(IAU, Colloquium on Cataclysmic Variables. Recent Multi-Frequency Observations and Theoretical Developments, 93rd, Bamberg, West
Statistics
Computation
5
Magnetic Stars, Magnetohydrodynamic Flow, Neutron Stars, Plasma Interactions, Stellar Mass Accretion, Stellar Radiation, Computational Astrophysics, Radiation Transport, Stellar Luminosity
Scientific paper
A detailed understanding of how the infalling matter in accretion columns is decelerated is essential for the calculation of the emitted radiation. On neutron stars, the deceleration takes place mainly by the interaction of the plasma with radiation, at least for the high-luminosity sources. Two-dimensional calculations of the hydrodynamic flow in such accretion colums are reported on. The radiation transport is treated in the diffusion approximation, and a stationary solution for the velocity field is looked for. The dependence of the results on physical parameters, especially on the accretion rate is discussed. Due to the nonlinearity of the problem it turns out that only in certain parameter ranges stationary solutions seem to exist. For accretion rates higher than a critical value there are no stationary accretion flows. This leads to the conclusion that a time-dependent picture for the accreetion is unavoidable.
Herold Heinz
Ruder Hanns
Wolf Kasandra
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