Spin-up and spin-down of an accreting compact object

Details Spin-up and spin-down of an accreting compact object Spin-up and spin-down of an accreting compact object

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987mnras.226..785m&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 226, June 15, 1987, p. 785-811.

Statistics

Computation

81

Angular Velocity, Neutron Stars, Stellar Mass Accretion, Stellar Winds, Two Dimensional Flow, X Ray Binaries, Computational Astrophysics, Mass Ratios, Stellar Mass Ejection

Scientific paper

Two-dimensional hydrodynamic calculations of an accretion flow onto a compact object fed by a stellar wind in a close binary system with a mass ratio of unity are presented for the case of a stellar wind driven by thermal pressure. Large absolute values for the efficiency factor are obtained, and it is found that the accreted angular momentum can become negative, in contradiction to previous results. The sporadic changing of sign of the accreted angular momentum for flip-flop flows may explain the periodic fluctuation noted for Vela X-1. For specific heat ratios of 5/3, sound speed of the gas, c(0), values greater than 2.5 give a conical accretion shock, while a c(0) value of 1.5 gives a retrograde rotating disk bounded by a bow shock from a wind gas.

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