Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976sval....2..111s&link_type=abstract
(Pis'ma v Astronomicheskii Zhurnal, vol. 2, June 1976, p. 287-293.) Soviet Astronomy Letters, vol. 2, May-June 1976, p. 111-114.
Astronomy and Astrophysics
Astronomy
5
Magnetohydrodynamic Flow, Neutron Stars, Plasma Radiation, X Ray Absorption, X Ray Sources, Eclipsing Binary Stars, Energy Dissipation, Optical Thickness, Plasma Layers, Pulsars, Thermal Instability, X Ray Spectra
Scientific paper
Parameters are determined for the plasma flowing over the Alfven surface of the neutron star in the source Her X-1, and the radiation from this plasma is evaluated. The parameters include the optical thickness of the Alfven-surface plasma layer for radiation from 'hot-spot' regions, the plasma density, and the plasma temperature. It is shown that absorption of hard X-radiation by streams of accreting plasma at the Alfven surface and the subsequent reradiation of the absorbed energy can explain both the origin of soft X-radiation and the strong modulation of hard X-radiation in Her X-1. It is noted that this mechanism can also account for the emission spectra of the sources Sco X-1, Cyg X-2, and Cyg X-3.
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