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Multiband echo tomography of Sco X-1 |
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| Authors: | T Muoz-Darias IG Martínez-Pais J Casares TR Marsh R Cornelisse D Steeghs VS Dhillon PA Charles |
| Institution: | aInstituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain bDepartment of Physics, University of Warwick, Coventry CV4 7AL, UK cSchool of Physics and Astronomy, U. Southampton, Southampton SOB17 1BJ, UK dHarvard-Smithsonian Center for Astrophysics, Cambridge MA 02138, USA eDepartment of Physics and Astronomy, University of Sheffield, Sheffield S3 7RH, UK fSouth African Astronomical Observatory, Cape Town 7935, South Africa |
| Abstract: | We present preliminary results of a simultaneous X-ray/optical campaign of the prototypical LMXB Sco X-1 at 1–10 Hz time resolution. Lightcurves of the high excitation Bowen/HeII emission lines and a red continuum at λc  6000 Å were obtained through narrow interference filters with ULTRACAM, and these were cross-correlated with simultaneous RXTE X-ray lightcurves. We find evidence for correlated variability, in particular when Sco X-1 enters the Flaring branch. The Bowen/HeII lightcurves lag the X-ray lightcurves with a light travel time which is consistent with reprocessing in the companion star while the continuum lightcurves have shorter delays consistent with reprocessing in the accretion disc. |
| Keywords: | Binaries: close X-rays: binaries Stars: individual: Sco X-1 |
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