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Title:
Numerical studies of wind accretion
Authors:
Anzer, U.; Boerner, G.; Monaghan, J. J.
Affiliation:
AA(Max-Planck-Institut fuer Physik und Astrophysik, Garching, West Germany), AB(Max-Planck-Institut fuer Physik und Astrophysik, Garching, West Germany), AC(Monash University, Clayton, Australia)
Publication:
Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 2, April 1987, p. 235-244. (A&A Homepage)
Publication Date:
04/1987
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
STELLAR MASS ACCRETION, STELLAR WINDS, X RAY BINARIES, X RAY SOURCES, ANGULAR MOMENTUM, COMPUTATIONAL FLUID DYNAMICS, MACH CONES, MOMENTUM TRANSFER, TWO DIMENSIONAL FLOW
Bibliographic Code:
1987A&A...176..235A

Abstract

Wind accretion from a companion star is assumed to be the power source for wide X-ray binaries. These winds will in general have spatial variations both in density and in the velocity vector. The authors have performed 2-dimensional numerical computations of such inhomogeneous wind flows to obtain estimates on the amount of angular momentum accreted for a given gradient of the velocity vector. They find that the angular momentum flux is about a factor 5 smaller than the previous estimates. This means that there is not enough angular momentum transferred to the neutron star to explain, for example, the long term period changes of Vela X-1. This leads the authors to propose a different mechanism for the spin-up and spin-down of sources of the type of Vela X-1. They outline briefly the physical features of such a model.

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