Optical photometry of the eclipsing Large Magellanic Cloud supersoft source CAL 87
arXiv:astro-ph/9702119 · doi:10.1093/mnras/287.3.699
Abstract
We present optical photometry of the eclipsing supersoft source, CAL87. 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 To = HJD 2450111.5144(3) + 0.44267714(6)E for the time of minimum light, (ii) find the eclipse structure to be stable over a period of 4 years, and (iii) investigate the colour variation as a function of orbital phase. The resolution afforded by the high speed nature of the white light observations enables us to see new structure in the light curve morphology.
6 pages Latex, 5 figures, to appear in MNRAS