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

C. Alcock, R. A. Allsman, D. R. 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. SouthwellC. W. Stubbs, W. Sutherland, D. L. Welch

Research output: Contribution to journalArticlepeer-review

10 Citations (Scopus)

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) + 0.44267714(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.

Original languageEnglish
Pages (from-to)699-704
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume287
Issue number3
DOIs
Publication statusPublished - 1997

Keywords

  • Accretion, accretion discs
  • Binaries: close
  • Binaries: spectroscopic
  • Magellanic clouds
  • Stars: individual: cal 87
  • X-rays: stars

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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