Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...242.1114t&link_type=abstract
Astrophysical Journal, Part 1, vol. 242, Dec. 15, 1980, p. 1114-1123. Research supported by the European Southern Observatory,
Astronomy and Astrophysics
Astronomy
41
Infrared Spectra, Spaceborne Astronomy, Ultraviolet Spectra, X Ray Sources, Absorption Spectra, Binary Stars, Late Stars, Satellite Observation, Spectral Line Width, Stellar Spectrophotometry, Stellar Winds, Supergiant Stars, X Ray Spectra, X Ray Stars
Scientific paper
During April, May, and July of 1978, HDE 226868, the optical counterpart of Cygnus X-1, was repeatedly observed in the ultraviolet with the IUE satellite. Some X-ray and infrared observations have been made during the same period. The general shape of the spectrum is that expected from a late O supergiant. Strong absorption features are apparent in the ultraviolet, some of which have been identified. The equivalent widths of the most prominent lines appear to be modulated with the orbital phase. This modulation is discussed in terms of the ionization contours calculated by Hatchett and McCray, for a binary X-ray source in the stellar wind of the companion.
Black John
Chiappetti Lucio
Davis Raymond Jr.
Dupree Andrea K.
Gursky Herbert
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