Optical spectroscopy of the massive X-ray binary SMC X-1/Sk 160

Details Optical spectroscopy of the massive X-ray binary SMC X-1/Sk 160 Optical spectroscopy of the massive X-ray binary SMC X-1/Sk 160

Mar 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993mnras.261..337r&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 261, no. 2, p. 337-345.

Physics

22

Eclipsing Binary Stars, Stellar Mass, Stellar Physics, Stellar Spectrophotometry, X Ray Binaries, Accretion Disks, Magellanic Clouds, Stellar Orbits

Scientific paper

New spectroscopy of Sk 160, the optical counterpart of SMC X-1, is presented. Improved mass estimates are derived for both components of the binary system, with and without non-Keplerian velocity corrections. The primary star is found to have a mass of 17.2 +/- 0.6 solar masses, with a best estimate for the mass of the compact component of 1.6 +/- 0.1 solar mass, which is within the theoretical mass range for neutron stars. Studies of line profile variations in the primary show that the effect of X-ray heating on the inner hemisphere is present but not dramatic. Distance estimates are derived, the lowest of which implies a sub-Eddington luminosity for the X-ray source, and places the system on the near side of the SMC.

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