Bowen blend echo-tomography of low mass X-ray binaries

T. Muñoz‐Darias, I. G. Martínez-Pais, J. Casares, R. Cornelisse, V. S. Dhillon, T. R. Marsh, D. Steeghs, K. O’Brien, P. A. Charles, M. Still

Type: Article

Publication Date: 2008-01-01

Citations: 5

DOI: https://doi.org/10.1063/1.2896925

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Abstract

We present simultaneous high time resolution (1–10 Hz) X‐ray and optical observations of the persistent LMXBs Sco X‐1 and V801 Ara( = 4U 1636‐536). In the case of Sco X‐1 we find that the Bowen/HeII emission lags the X‐ray light‐curves with a light travel time of ∼11–16 s which is consistent with reprocessing in the donor star. We also present the detection of three correlated X‐ray/optical bursts in V801 ara. Although this latter project is still in progress our preliminary results obtained by subtracting the Continuum light‐curve from the Bowen/HeII data provide evidence of orbital phase dependent echoes from the companion star.

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