Constraints on the inclination and masses of the HDE 226868/Cygnus X-1 system from the observations

Details Constraints on the inclination and masses of the HDE 226868/Cygnus X-1 system from the observations Constraints on the inclination and masses of the HDE 226868/Cygnus X-1 system from the observations

Jul 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...270..671d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 270, July 15, 1983, p. 671-677. Research sponsored by the European Space Ag

Astronomy and Astrophysics

Astrophysics

20

Binary Stars, Stellar Mass, Stellar Winds, X Ray Sources, Cygnus Constellation, Iue, Orbital Elements, Stellar Rotation, Ultraviolet Spectra

Scientific paper

Analyses of two high-dispersions IUE spectra of HDE 226868 (the optical counterpart of Cygnus X-1) are combined with studies of low-dispersion IUE spectra to provide a more accurate determination of the variation of C IV stellar wind absorption as a function of orbital phase. By incorporating these observational results into an analysis of the structure of the X-ray ionization cavity in the stellar wind, it is found that the orbital inclination must lie between 36 and 67 deg, leading to a mass for the compact object between 5.7 and 11.2 solar masses.

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