The X-ray Eclipse of the LMC Binary CAL 87
Abstract
ROSAT-PSPC observations of the LMC eclipsing binary CAL 87 show a short-duration, shallow X-ray eclipse which coincides in phase with the primary optical minimum. Characteristics of the eclipse suggest the X-ray emitting region is only partially occulted. Similarities with the eclipse of the accretion-disk corona in X1822-37 are discussed. However, no temperature variation through eclipse is found for CAL 87. A revised orbital period, combining published data and recent optical photometry, is given. (SECTION: Stars)
- Publication:
-
Publications of the Astronomical Society of the Pacific
- Pub Date:
- August 1993
- DOI:
- 10.1086/133246
- Bibcode:
- 1993PASP..105..863S
- Keywords:
-
- Eclipsing Binary Stars;
- Magellanic Clouds;
- X Ray Binaries;
- Accretion Disks;
- Light Curve;
- Stellar Coronas;
- Stellar Orbits;
- Stellar Spectrophotometry;
- Astronomy;
- BINARIES: ECLIPSING;
- STARS: INDIVIDUAL: CAL 87