Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975apj...199..196m&link_type=abstract
Astrophysical Journal, vol. 199, July 1, 1975, pt. 1, p. 196-205.
Astronomy and Astrophysics
Astronomy
62
Binary Stars, Mass Transfer, Stellar Winds, X Ray Astronomy, X Ray Stars, Gas Flow, Plasma Heating, Radiant Heating, Stellar Atmospheres, Stellar Mass Ejection
Scientific paper
The influence of X-ray heating on gas flows in binary X-ray systems is examined. A simple estimate is obtained for the evaporative wind flux from a stellar atmosphere due to X-ray heating which agrees with numerical calculations by Alme and Wilson (1974) but disagrees with calculations by Arons (1973) and by Basko and Sunyaev (1974) for the Her X-1/HZ Her system. The wind flux is sensitive to the soft X-ray spectrum. The self-excited wind mechanism does not work. Mass transfer in the Hercules system probably occurs by flow of the atmosphere of HZ Her through the gravitational saddle point of the system. The accretion gas stream is probably opaque with atomic density of not less than 10 to the 15th power per cu cm and is confined to a small fraction of 4(pi) steradians. Other binary X-ray systems are briefly discussed.
Hatchett Stephen
McCray Richard
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