Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.179p..15d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 179, Apr. 1977, p. 15P-20P.
Astronomy and Astrophysics
Astronomy
14
Eclipsing Binary Stars, Light Curve, Magellanic Clouds, Pulsars, X Ray Sources, Angular Velocity, Orbital Elements, Spaceborne Astronomy, Stellar Rotation
Scientific paper
Results are reported for 44 separate measurements of the pulsation period and the average light curve of SMC X-1 made over a complete binary cycle with instruments aboard the Ariel V satellite. The eclipse semiduration is estimated to be about 0.310 day, a spectral slope of approximately -1.3 is determined, and a best-fit pulsation period of about 0.1747337 sec is obtained. A comparison with a previous measurement by the SAS 3 satellite implies a period change of 3.7 microsec per binary period, corresponding to a spin-up rate of approximately -1.55 by 10 to the -11th power per sec. The phase zeros given by the Ariel V and SAS 3 measurements are used to derive a binary period of about 3.89229 days, which is free of any possible systematic error due to uncertainty in measuring an eclipse center from the geometrical eclipse.
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