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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. 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. doi:10.1111/j.1365-2966.2007.12045.x ISSN 0035-8711.
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WRAP_Steeghs_Companion_star_ 0705.4568v1.pdf - Accepted Version Download (1407Kb) | Preview |
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, Engineering and Medicine > Science > Physics | ||||
| Library of Congress Subject Headings (LCSH): | X-ray binaries | ||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||
| Publisher: | Wiley | ||||
| ISSN: | 0035-8711 | ||||
| Official Date: | 21 August 2007 | ||||
| Dates: |
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| Volume: | Vol.379 | ||||
| Number: | No.4 | ||||
| Number of Pages: | 10 | ||||
| Page Range: | pp. 1637-1646 | ||||
| DOI: | 10.1111/j.1365-2966.2007.12045.x | ||||
| Status: | Peer Reviewed | ||||
| Publication Status: | Published | ||||
| Access rights to Published version: | Restricted or Subscription Access | ||||
| Date of first compliant deposit: | 15 December 2015 | ||||
| Date of first compliant Open Access: | 15 December 2015 | ||||
| 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) |
Data sourced from Thomson Reuters' Web of Knowledge
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