On the allowed size of an accretion disk in Cygnus X-1

Details On the allowed size of an accretion disk in Cygnus X-1 On the allowed size of an accretion disk in Cygnus X-1

Jan 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...235..595k&link_type=abstract

Astrophysical Journal, Part 1, vol. 235, Jan. 15, 1980, p. 595-602.

Astronomy and Astrophysics

Astronomy

11

Binary Stars, Cygnus Constellation, Stellar Mass Accretion, Stellar Spectra, X Ray Sources, Black Holes (Astronomy), Diameters, H Beta Line, Neutron Stars, Optical Polarization, Radiative Heat Transfer, Stellar Models

Scientific paper

The possible diameter and thickness of an accretion disk around a collapsed secondary in Cygnus X-1 are investigated in order to investigate the applicability of standard accretion disk models to optical polarization and H beta photometry observations. For a disk extending at least to Paczynski's limit (0.16 times the separation between the primary and the secondary), numerical estimates, based on standard disk models, of disk heights of at least 10 to the 5th to 10 to the 6th km, depending on the presence of radiative heating and disk thermalization, are obtained. The estimated dimensions are found to account for the observed inner eclipse, and the calculated structure of the disk is illustrated. It is also noted that the results are compatible with a black-hole secondary heavier than four solar masses.

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