Optical photometry of the eclipsing Large Magellanic Cloud supersoft source CAL87
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 T_0=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 yr, 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.
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 1997
- DOI:
- 10.1093/mnras/287.3.699
- arXiv:
- arXiv:astro-ph/9702119
- Bibcode:
- 1997MNRAS.287..699A
- Keywords:
-
- ACCRETION;
- ACCRETION DISCS;
- BINARIES: CLOSE;
- BINARIES: SPECTROSCOPIC;
- STARS: INDIVIDUAL: CAL87;
- MAGELLANIC CLOUDS;
- X-RAYS: STARS;
- Astrophysics
- E-Print:
- 6 pages Latex, 5 figures, to appear in MNRAS