Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...232..878c&link_type=abstract
Astrophysical Journal, Part 1, vol. 232, Sept. 15, 1979, p. 878-881. Research supported by the National Research Council of Can
Astronomy and Astrophysics
Astrophysics
2
Binary Stars, Centaurus Constellation, Neutron Stars, Stellar Mass Accretion, Stellar Winds, X Ray Stars, Stellar Mass Ejection, Stellar Models, Stellar Occultation, Wind Velocity
Scientific paper
A neutron star orbiting a stellar-wind star can be used as a probe of wind density and velocity. It is argued that Cen X-3 accretes mass from a stellar wind and that the model previously proposed by the author for supersonic accretion is applicable to Cen X-3. Combining X-ray data of one transition from low to high state, a previous suggestion that this type of transition is due to a decrease in the density of the stellar wind, and the model, allows one to deduce the variation of density and velocity in the stellar wind during the transition. It is found that the velocity decreases as the density decreases. This correlation between the stellar-wind density and velocity implies that the stellar-wind mass loss decreases during the transition. The result is discussed with respect to the mechanism for the acceleration of the wind.
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