Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1975
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975azh....52..457b&link_type=abstract
Astronomicheskii Zhurnal, vol. 52, May-June 1975, p. 457-468. In Russian.
Astronomy and Astrophysics
Astronomy
13
Astronomical Models, Binary Stars, Neutron Stars, Periodic Variations, Pulsars, X Ray Sources, Pencil Beams, Stellar Magnetic Fields, Stellar Mass Ejection, Stellar Rotation
Scientific paper
A model for the binary system containing Her X-1 is considered in which the primary star has a sufficiently strong magnetic field so that the outflow of matter from it occurs in the form of jets. It is shown that when the neutron star is located in a jet, the optical depth for X-rays exceeds unity and the pulsar has a wide directivity pattern. In the opposite case (when the optical depth is less than unity), a pencil-beam pattern results and no emission is observable. Calculations indicate that the 35-day cycle can be explained if the pulsar revolves around the primary in 35 days and the size of a jet equals one-third of the orbital dimensions. Variability in the 35-day cycle is thought to be associated with irregular motions of the primary's magnetic poles. Some optical features of this binary system are discussed.
Bisnovatyi-Kogan Gennadi S.
Komberg Boris V.
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