NASA NTRS · 19770033183
Orbital elements and masses for the SMC X-1/Sanduleak 160 binary system
Abstract
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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Primini, F., Clark, G. W., Lewin, W., Li, F., Mayer, W., Mcclintock, J., Rappaport, S., Joss, P. C.. 1976-12-01. Orbital elements and masses for the SMC X-1/Sanduleak 160 binary system. https://ntrs.nasa.gov/citations/19770033183
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