Some magnetic effects in stellar collapse and accretion

Details Some magnetic effects in stellar collapse and accretion Some magnetic effects in stellar collapse and accretion

Oct 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975nyasa.262..123w&link_type=abstract

(AAS, American Physical Society, and New York Academy of Sciences, Texas Symposium on Relativistic Astrophysics, 7th, Dallas, Te

Astronomy and Astrophysics

Astronomy

29

Black Holes (Astronomy), Gravitational Collapse, Magnetic Effects, Stellar Evolution, Astronomical Models, Equations Of Motion, Magnetohydrodynamics, Schwarzschild Metric

Scientific paper

Magnetic effects due to accretion of magnetized material onto a black hole are analyzed. Numerical solutions are obtained for previously reported (Bardeen and Wagoner, 1971) gravitational field equations and magnetohydrodynamic equations, extended to include perfect conducting material with an embedded magnetic field. A supermassive star is considered. The energies are taken such that the star is a few per cent undersupported. The initial stellar configuration is a spherically symmetric density distribution with an exponential radial falloff. The boundary conditions are imposed that no material or magnetic field lines leave the calculational grid. For calculations of material motion near a black hole it is assumed that the metric is given by the metric of the black hole alone. Calculations are carried out with a Schwarzschild and an extreme Kerr metric. Energy extraction from the black hole in the case of accretion is demonstrated, and it is shown heuristically how a charged black hole might form in collapse.

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