The spectroscopic orbit and masses of SK 160/SMC X-1

Details The spectroscopic orbit and masses of SK 160/SMC X-1 The spectroscopic orbit and masses of SK 160/SMC X-1

Oct 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217..186h&link_type=abstract

Astrophysical Journal, Part 1, vol. 217, Oct. 1, 1977, p. 186-196.

Astronomy and Astrophysics

Astronomy

61

Eclipsing Binary Stars, Orbital Elements, Stellar Mass, Stellar Spectra, X Ray Stars, H Alpha Line, Radial Velocity, Stellar Luminosity, Stellar Rotation, Stellar Spectrophotometry, Stellar Winds, X Ray Astronomy

Scientific paper

Thirty-one spectrographic observations have been obtained of SK 160, with dispersions from 12 to 52 A/mm. Radial velocities from these lead to a spectroscopic orbit which implies masses of about 16.2 and 1.02 solar masses for the two components and i = 64-70 deg for the system. Mass exchange appears to be by Roche-lobe overflow rather than a strong stellar wind. There are also spectroscopic indications of a heating effect by X-rays, but no line-velocity distortions are found, in rough agreement with calculations. Radial velocities and intensity measurements of He II 4686-A emission suggest that the line is formed in a hot spot between the two stars and slightly trailing the X-ray source.

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