Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988mnras.231...69d&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 231, March 1, 1988, p. 69-84. Research supported by the
Astronomy and Astrophysics
Astronomy
21
Stellar Atmospheres, Stellar Mass Accretion, Stellar Oscillations, Stellar Spectra, X Ray Binaries, Exosat Satellite, Lagrangian Equilibrium Points, Radiation Pressure, Stellar Models
Scientific paper
EXOSAT data from three high-state egresses of the pulsating X-ray binary Her X-1 are presented. Analysis of these data indicates that the extended atmosphere of the companion is the most likely explanation of the extent of the egresses. By fitting spectra taken from the egresses the authors find that the atmosphere has an exponential structure. If hydrostatic equilibrium is assumed, the derived temperature renders the atmosphere more luminous than is observed. A dynamical model is proposed in which the atmospheric scale height is enhanced by the action of the Coriolis force on flows driven along the stellar surface by the radiation pressure of the X-ray source. The particle density and temperature at the L1 point are not high enough to provide the observed accretion rate, if hydrostatic equilibrium is assumed.
Day Charles S. R.
Fabian Andrea C.
Tennant Allyn F.
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