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

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 67...

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Bibliographic Details
Published in:Monthly notices of the Royal Astronomical Society 1997-05, Vol.287 (3), p.699-704
Main Authors: Alcock, C., Allsman, R. A., Alves, D. R., Axelrod, T. S., Bennett, D. P., Charles, P. A., Cook, K. H., O'Donoghue, D., Freeman, K. C., Griest, K., Guern, J., Lehner, M. J., Livio, M., Marshall, S. L., Minniti, D., Peterson, B. A., Pratt, M. R., Quinn, P. J., Rodgers, A. W., Southwell, K. A., Stubbs, C. W., Sutherland, W., Welch, D. L.
Format: Article
Language:English
Subjects:
accretion
accretion discs
binaries: close
binaries: spectroscopic
Magellanic Clouds
stars: individual: CAL 87
X-rays: stars
Citations: Items that cite this one
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Summary: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.
ISSN:0035-8711
1365-2966
DOI:10.1093/mnras/287.3.699