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Abstract: We present simultaneous high time resolution 1-10 Hz X-ray and opticalobservations of the persistent LMXBs Sco X-1 and V801 Ara=4U 1636-536. In thecase of Sco X-1 we find that the Bowen-HeII emission lags the X-raylight-curves with a light travel time of ~11-16s which is consistent withreprocessing in the donor star. We also present the detection of threecorrelated X-ray-optical bursts in V801 ara. Although this latter project isstill in progress our preliminary results obtained by subtracting the Continuumlight-curve from the Bowen-HeII data provide evidence of orbital phasedependent echoes from the companion star.

Autor: T. Muñoz-Darias, I. G. Martinez-Pais, J. Casares, R. Cornelisse, V. S. Dhillon, T. R. Marsh, D. Steeghs, K. O'Brien, P. A.


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