Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978pazh....4...75s&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 4, Feb. 1978, p. 75-80.) Soviet Astronomy Letters, vol. 4, Jan.-Feb. 1978, p. 39-42. Tr
Astronomy and Astrophysics
Astronomy
2
Stellar Mass Accretion, Stellar Winds, X Ray Sources, Black Holes (Astronomy), Gas Expansion, Late Stars, Neutron Stars, Stellar Envelopes, Supergiant Stars
Scientific paper
Unsteady stellar-wind accretion onto the relativistic object in close binaries consisting of a late-type supergiant with a strong stellar wind plus a neutron star or black hole is investigated. The cases of low- and high-density stellar winds are considered, the effect of radiation from an X-ray source on a stellar wind is examined, and two modes of unsteady accretion are analyzed which might lead, respectively, to transient X-ray sources and X-ray bursters. The first mode involves a large mean accretion rate and a low wind velocity; the second, a small mean accretion rate and a low wind velocity. An approximate solution for an expanding gas envelope about a relativistic star is obtained, and effects of radiative gas cooling are evaluated. It is shown that the duration of an X-ray burst will be inversely proportional to the effective temperature of the X-rays.
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