Optical properties of the accretion disk in the HZ Herculis system

Details Optical properties of the accretion disk in the HZ Herculis system Optical properties of the accretion disk in the HZ Herculis system

Apr 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977sva....21..133b&link_type=abstract

(Astronomicheskii Zhurnal, vol. 54, Mar.-Apr. 1977, p. 241-253.) Soviet Astronomy, vol. 21, Mar.-Apr. 1977, p. 133-140. Transla

Astronomy and Astrophysics

Astronomy

10

Optical Properties, Stellar Mass Accretion, Stellar Spectrophotometry, Supergiant Stars, Ubv Spectra, X Ray Sources, Binary Stars, Neutron Stars, Pulsars, Stellar Luminosity, Stellar Models, Stellar Temperature, Temperature Distribution

Scientific paper

Previous UBVR photoelectric observations conducted near the primary minimum of the HZ Her (Her X-1) system are analyzed in order to study the properties of the optical structure around the neutron star. For an optically opaque structure, the best agreement with the observations is obtained with a model of a geometrically thin disk projected in the observing plane as an ellipse having a semiaxis ratio of 0.25 and an orbital inclination angle of 81 deg. Computational results are presented which show that the integral disk parameters vary with the phase of the 35-day cycle and that the average temperature, total luminosity, and extent of the disk have two maxima corresponding to the 'on' state and near the middle of the 'off' state. It is suggested that the dominant optical disk luminosity is associated with reradiation of X-ray emission, while differences between the 'on' and 'off' states are related to variations in the X-ray flux incident on the disk caused by changes in the width of the directivity pattern.

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