Year: 1997
Type: article
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 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.
Authors: 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. Southwell, C. W. Stubbs, W. Sutherland, D. L. Welch
Institutions: Lawrence Livermore National Laboratory, University of California, Berkeley, Australian National University, University of California, Davis, University of Oxford, University of Cape Town, University of California San Diego, Space Telescope Science Institute, University of California, Santa Barbara, University of Washington, McMaster University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2123169723