The parameters of the CYG X-1 system

Details The parameters of the CYG X-1 system The parameters of the CYG X-1 system

Aug 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987azh....64..803s&link_type=abstract

Astronomicheskii Zhurnal (ISSN 0004-6299), vol. 64, July-Aug. 1987, p. 803-814. In Russian.

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Computational Astrophysics, Orbital Elements, Spectrum Analysis, Stellar Mass, Supergiant Stars, Spectral Line Width, Stellar Atmospheres, Stellar Models

Scientific paper

Estimations are given of the mass of the supergiant HDE 226868 in the system Cyg X-1 which are made on the basis of interpretation of spectroscopic observations by means of the model-atmosphere method. The mass turns out to be M* = (16±3) M_sun;. Provided the zone of formation of the emission He II λ4686 Å must be localized near the supergiant surface, the least value of inclination of the system's orbit plane is estimated: i ⪆ 35°. The possibility is pointed out of variability of equivalent widths of He II emission λ4686 Å, which is connected with eclipse of the "spot". It is noted that for large angles (i ⪆ 35°) of orbit inclination, the mass of the degenerate star in the system Cyg X-1 does not exceed 10 M_sun;.

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