Hydrodynamics of X-ray induced stellar winds

Details Hydrodynamics of X-ray induced stellar winds Hydrodynamics of X-ray induced stellar winds

Jul 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...258..260l&link_type=abstract

Astrophysical Journal, Part 1, vol. 258, July 1, 1982, p. 260-269. Research supported by the Smithsonian Institution

Astronomy and Astrophysics

Astrophysics

35

Binary Stars, Hydrodynamics, Stellar Winds, X Rays, Stellar Mass Ejection, Stellar Models

Scientific paper

New theoretical models are developed for X-ray induced stellar winds in binary systems on the basis of an accurate treatment of the hydrodynamics. The hydrodynamic equations are solved numerically in one dimension using an idealized model for the atomic processes involved in gas heating and cooling. It is found that the results depend on three dimensionless parameters which are ratios of characteristic temperatures and time scales. Mass-loss rates are estimated, and it is shown that stars which are not close to their critical Roche lobes have too small a mass-loss rate to power the X-ray emission. However, as the stars come close to filling the Roche lobe, the mass loss turns on. Thus, X-ray induced winds may play a significant role in mass transfer of low-mass stars, but only if they have already expanded to nearly fill their Roche lobes.

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