Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1978
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978azh....55..564g&link_type=abstract
Astronomicheskii Zhurnal, vol. 55, May-June 1978, p. 564-571. In Russian.
Astronomy and Astrophysics
Astronomy
3
Binary Stars, Polarization Characteristics, Stellar Mass Accretion, X Ray Astronomy, X Ray Stars, Convective Heat Transfer, Linear Polarization, Magnetic Effects, Stellar Models, Vector Analysis
Scientific paper
The polarization of X radiation from an accretion disk in a binary X-ray source is investigated. Calculations are discussed which indicate that radiation from an accretion disk is linearly polarized as a result of Thomson scattering, that the hard X-ray electric vector lies in the orbital plane in the standard disk model, and the soft X-ray/UV electric vector is perpendicular to the orbital plane. Deviations from a standard disk are shown to lead to the following polarization effects: (1) in a disk with convective heat transport a situation may arise where the hard X-ray electric vector oscillates perpendicular to the orbital plane; (2) the plane of electric-vector oscillations may be rotated as frequency changes in a warped disk; and (3) the degree of linear polarization of emergent radiation will be about 3/4 of that expected for the standard model if there is a hot optically thick corona above the disk.
Gnedin Iu. N.
Silant'ev N. A.
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