Author/Authors :
T. Mu?oz-Darias، نويسنده , , I.G. Mart?nez-Pais، نويسنده , , J. Casares، نويسنده , , T.R. Marsh، نويسنده , , R. Cornelisse، نويسنده , , D. Steeghs، نويسنده , , V.S. Dhillon، نويسنده , , P.A. Charles، نويسنده ,
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.
