Echoes from the companion star in Sco X-1

Bibcode
2007MNRAS.379.1637M
DOI
10.1111/j.1365-2966.2007.12045.x
Muñoz-Darias, T.; Martínez-Pais, I. G.; Casares, J.; Dhillon, V. S.; Marsh, T. R.; Cornelisse, R.; Steeghs, D.; Charles, P. A.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 379, Issue 4, pp. 1637-1646.

Advertised on:
8
2007
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
8
IAC number of authors
4
Citations
29
Refereed citations
22
Description
We present simultaneous X-ray (RXTE) and optical (ULTRACAM) narrow-band (Bowen blend/HeII and nearby continuum) observations of Sco X-1 at 2-10 Hz time resolution. We find that the Bowen/HeII emission lags the X-ray light curves with a light traveltime of s which is consistent with reprocessing in the companion star. The echo from the donor is detected at orbital phase ~0.5 when Sco X-1 is at the top of the flaring branch (FB). Evidence of echoes is also seen at the bottom of the FB but with time-lags of 5-10s which are consistent with reprocessing in an accretion disc with a radial temperature profile. We discuss the implication of our results for the orbital parameters of Sco X-1.
Type
Refereed
Accretion

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