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Optical Photometry of the Eclipsing LMC Supersoft Source CAL 87

Abstract

We present optical photometry of the eclipsing supersoft source, CAL 87. We find the eclipse structure to be stable over ~ 4 y, derive an improved ephemeris of T o = HJD 2450111.5144(3)+0.442674(7)E, and see new structure in the light curve morphology.

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References

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Alcock, C. et al. 1996, MNRAS, submitted
Armitage, P.J. & Livio, M. 1996, ApJ, in press
Callanan, P.J., Machin, G., Naylor, T. & Charles, P.A. 1989, MNRAS, 241, 37P
Cook, M.C. & Warner, B. 1984, MNRAS, 207, 705
Schmidtke, P.C., McGrath, T.K., Cowley, A.P. & Frattare, L.M. 1993, PASP, 105, 863
van den Heuvel, E.P.J., Bhattacharya, D., Nomoto, K. & Rappaport, S.A. 1992, A&A, 262, 97

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