Bowen blend echo-tomography of low mass X-ray binaries
T. Mu\~noz-Darias, I. G. Martinez-Pais, J. Casares, R. Cornelisse, V., S. Dhillon, T. R. Marsh, D. Steeghs, K. O'Brien, P. A. Charles, M. Still
TL;DR
This study uses simultaneous high-resolution X-ray and optical observations of low mass X-ray binaries to investigate reprocessing and orbital phase-dependent echoes, revealing light travel times and correlated bursts.
Contribution
It provides new measurements of reprocessing delays and evidence of orbital phase-dependent echoes in LMXBs using high time resolution data.
Findings
Bowen/HeII emission lags X-ray light by 11-16 seconds in Sco X-1.
Detected three correlated X-ray/optical bursts in V801 Ara.
Evidence of orbital phase-dependent echoes from the companion star.
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 ~11-16s 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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