Echoes from the companion star in Sco X-1

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dc.creatorMuñoz-Darias, T.
dc.creatorMartinez-Pais, I. G.
dc.creatorCasares, J.
dc.creatorDhillon, V. S.
dc.creatorMarsh, T. R.
dc.creatorCornelisse, R.
dc.creatorSteeghs, D.
dc.creatorCharles, P. A.
dc.date2007-05-31
dc.date.accessioned2026-07-07T10:55:57Z
dc.date.available2026-07-07T10:55:57Z
dc.descriptionWe 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 travel time of ~11-16s 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. Evidence of echoes is also seen at the bottom of the Flaring Branch 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.
dc.descriptionAccepted for publication in MNRAS
dc.identifierhttps://arxiv.org/abs/0705.4568
dc.identifierhttp://arxiv.org/abs/0705.4568
dc.identifierMon.Not.Roy.Astron.Soc.379:1637-1646,2007
dc.identifierdoi:10.1111/j.1365-2966.2007.12045.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/186253
dc.subjectAstrophysics
dc.titleEchoes from the companion star in Sco X-1
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