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Optical studies of UHURU sources. XII - The light curve of Scorpius X-1 = V818 Scorpii, 1889-1974
Wright, E. L.; Gottlieb, E. W.; Liller, W.
AA(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass.), AB(Smithsonian Astrophysical Observatory and Harvard College Observatory, Cambridge, Mass.)
Astrophysical Journal, vol. 200, Aug. 15, 1975, pt. 1, p. 171-176. (ApJ Homepage)
Publication Date:
NASA/STI Keywords:
Binary Stars, Light Curve, Stellar Luminosity, Uhuru Satellite, X Ray Sources, Gravitational Collapse, Radial Velocity, Stellar Radiation, Stellar Spectrophotometry, X Ray Stars
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An analysis of 1068 photographic observations of V818 Sco = Sco X-1 from the Harvard plate collection, as well as 698 post discovery magnitudes, shows that its B magnitude ranges between 11.8 and 13.7. However, there is strong evidence that Sco X-1 has been systematically fainter by 0.3-0.4 mag since the mid-1960s. All the available magnitudes have been combined to give an improved mean light curve at the .787313-day period derived by Gottlieb, Wright, and Liller. The double period light curve, folded at 1.574626 days, is also given and discussed. The radial velocity curve, based on published data, and the variations in color make it possible to draw new conclusions on plausible models for Sco X-1.

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