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Echoes from the companion star in Sco X-1

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Muñoz-Darias, T., Martinez-Pais, I. G., Casares, J., Dhillon, V. S., Marsh, T. R., Cornelisse, R., Steeghs, D. (Danny), 1972- and Charles, P. A.. (2007) Echoes from the companion star in Sco X-1. Monthly Notices of the Royal Astronomical Society, Vol.379 (No.4). pp. 1637-1646. ISSN 0035-8711

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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2007.12045.x

Abstract

We present simultaneous X-ray (RXTE) and optical (ULTRACAM) narrow-band ( Bowen blend/He II and nearby continuum) observations of Sco X-1 at 2-10 Hz time resolution. We find that the Bowen/He II emission lags the X-ray light curves with a light traveltime of similar to 11-16 s which is consistent with reprocessing in the companion star. The echo from the donor is detected at orbital phase similar to 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 5-10 s 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.

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray binaries
Journal or Publication Title:	Monthly Notices of the Royal Astronomical Society
Publisher:	Wiley-Blackwell Publishing, Inc
ISSN:	0035-8711
Date:	21 August 2007
Volume:	Vol.379
Number:	No.4
Number of Pages:	10
Page Range:	pp. 1637-1646
Identification Number:	10.1111/j.1365-2966.2007.12045.x
Status:	Peer Reviewed
Publication Status:	Published
Access rights to Published version:	Restricted or Subscription Access
Funder:	Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Spain. Ministerio de Ciencia e Innovación (MICINN), Particle Physics and Astronomy Research Council (Great Britain) (PPARC), Smithsonian Astrophysical Observatory, United States. National Aeronautics and Space Administration (NASA)
Grant number:	PP/D002370/1 (PPARC), AYA2002-03570 (MICINN), NNG04G014G (NASA)
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