Orbital elements and masses for the SMC X-1/Sanduleak 160 binary system

Details Orbital elements and masses for the SMC X-1/Sanduleak 160 binary system Orbital elements and masses for the SMC X-1/Sanduleak 160 binary system

Dec 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976apj...210l..71p&link_type=abstract

Astrophysical Journal, vol. 210, Dec. 1, 1976, pt. 2, p. L71-L74.

Astronomy and Astrophysics

Astrophysics

32

Eclipsing Binary Stars, Orbital Elements, Orbital Velocity, Stellar Mass, X Ray Sources, Magellanic Clouds, Sas, Velocity Distribution, X Ray Stars

Scientific paper

The binary X-ray source SMC X-1 was observed with the SAS-3 satellite for approximately four days (February 26-29, 1976). Sufficient timing data were obtained on the 0.71 s X-ray pulsations to measure the Doppler velocity curve of the X-ray source and thereby derive orbital and stellar parameters for the system. The projected velocity of the X-ray star is 301.5 plus or minus 2.0 (1 sigma) km/s, and the corresponding mass function is 11.05 plus or minus 0.22 (1 sigma) solar masses. Combining the X-ray timing data with constraints imposed by the X-ray eclipse duration and the available optical data on Sk 160, a range of allowable values of not less than 1.1 and not greater than 4.0 solar masses for the mass of the X-ray star is obtained.

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