Stellar parameters of five early type companions of X-ray sources

Details Stellar parameters of five early type companions of X-ray sources Stellar parameters of five early type companions of X-ray sources

Feb 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978a%26a....63..225c&link_type=abstract

Astronomy and Astrophysics, vol. 63, no. 1-2, Feb. 1978, p. 225-235. Research supported by the Nederlandse Organisatie voor Zui

Astronomy and Astrophysics

Astrophysics

146

Binary Stars, Companion Stars, Early Stars, Orbital Elements, X Ray Sources, X Ray Stars, Astronomical Spectroscopy, Stellar Mass Accretion, Stellar Models, Stellar Winds, X Ray Binaries

Scientific paper

Orbital parameters of five early type companions to X-ray sources are employed in positioning the companions in a Hertzsprung-Russell diagram. All the optical companions appear to be overluminous in comparison to their masses. In addition, accretion velocities of the five X-ray binaries are derived under the assumption that the X-ray source is powered by accretion from a stellar wind; an efficiency factor of 0.01 for converting potential energy into X-radiation is necessary to reconcile the accretion velocity calculations with values predicted for single stars of similar type. The role of an overflow of material from a Roche or tidal lobe in the accretion process is also considered.

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