Orbit, spectrum and H alpha variations of HD 77581 /3 U 0900-40/

Details Orbit, spectrum and H alpha variations of HD 77581 /3 U 0900-40/ Orbit, spectrum and H alpha variations of HD 77581 /3 U 0900-40/

Oct 1974

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1974a%26a....35..353z&link_type=abstract

Astronomy and Astrophysics, vol. 35, no. 3, Oct. 1974, p. 353-360.

Astronomy and Astrophysics

Astrophysics

43

Eclipsing Binary Stars, H Alpha Line, Orbital Elements, Radial Velocity, Stellar Spectra, X Ray Sources, Astronomical Photometry, B Stars, H Beta Line, Line Shape, Stellar Mass, Supergiant Stars, X Ray Binaries

Scientific paper

The B 0.5 Ia star HD 77581 is the optical candidate for the eclipsing X-ray source 3 U 0900-40. Radial velocities were obtained from ESO (La Silla, Chile) coude spectra. Variations of profiles of H alpha, H beta, and some He I lines are described. Arguments are presented indicating that supergiants in massive X-ray binaries are unlikely to have suffered appreciable mass loss. The lack of regular pulsations and the mass estimate for the components indicate that the X-ray source may be a black hole rather than a neutron star.

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