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Optical photometry of the eclipsing Large Magellanic Cloud supersoft source CAL 87

C. Alcock,R. A. Allsman,D. Alves,T. S. Axelrod,D. P. Bennett,P. A. Charles,K. H. Cook,D. O'Donoghue,K. C. Freeman,K. Griest,J. Guern,M. J. Lehner,M. Livio,S. L. Marshall,D. Minniti,B. A. Peterson,M. R. Pratt,P. J. Quinn,A. W. Rodgers,K. A. Southwell,C. W. Stubbs,W. Sutherland,D. L. Welch

Monthly Notices of the Royal Astronomical Society（1997）

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Abstract
We present optical photometry of the eclipsing supersoft source CAL 87. These observations comprise long-term data accumulated as a by-product of the MACHO Project, and high-speed, white-light photometry of a single eclipse. We (i) derive an improved ephemeris of T0 = HJD 245 0111.5144(3) + 0.442 677 14(6)E for the time of minimum light, (ii) find the eclipse structure to be stable over a period o...
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Key words
accretion, accretion discs,binaries: close,binaries: spectroscopic,stars: individual: CAL 87,Magellanic Clouds,X-rays: stars
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