The He II 4686-A and H-alpha emission lines of Cygnus X-1

Details The He II 4686-A and H-alpha emission lines of Cygnus X-1 The He II 4686-A and H-alpha emission lines of Cygnus X-1

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...321..438n&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 321, Oct. 1, 1987, p. 438-446. NSERC-supported research.

Astronomy and Astrophysics

Astrophysics

17

Emission Spectra, Line Spectra, Stellar Spectra, X Ray Binaries, H Alpha Line, Helium, Radial Velocity, Spectral Line Width, Stellar Mass Ejection

Scientific paper

The results of a long-term monitoring program of the He II 4686-A and H-alpha emission lines of the massive X-ray binary Cygnus X-1 are presented. The radial velocities of the residual He II 4686-A emission profiles can be fitted to a smooth sinusoid with little scatter with no significant eccentricity. There is no significant variation in the K amplitude estimated at different epochs which implies a stable origin for the emission. There is a phase lag of 134 deg between the absorption and emission velocity curves. The results support the model of Friend and Castor (1982) in which the primary star almost fills its Roche lobe and has an enhanced mass flow toward the secondary. The He II 4686-A emission strength is strongly modulated with the 5.6-day orbital period.

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