H-alpha emission in Cygnus X-1 1977

Details H-alpha emission in Cygnus X-1 1977 H-alpha emission in Cygnus X-1 1977

Dec 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979pasp...91..796h&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 91, Dec. 1979-Jan. 1980, p. 796-799.

Astronomy and Astrophysics

Astronomy

9

Cygnus Constellation, H Alpha Line, Stellar Spectra, X Ray Sources, X Ray Stars, Emission Spectra, Radial Velocity, Signal To Noise Ratios

Scientific paper

H-alpha observations obtained during the 1977 coordinated campaign on Cyg X-1 are presented. Photographic and reticon data were corrected for the primary-star photospheric absorption-line profile and combined in five phase bins to increase the signal-to-noise ratio. The remaining emission profile differs from that observed in 1974, showing a broad, double-peaked structure at all phases, with a central absorption feature which changes systematically with phase. The emission appears to be associated largely, but not entirely, with the optical primary and is very similar to the H-alpha emission in the similar binary HD 152667 = V861 Sco.

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