Multiband Echo Tomography of Sco X-1

Details Multiband Echo Tomography of Sco X-1 Multiband Echo Tomography of Sco X-1

2005-07-04

arxiv.org/abs/astro-ph/0507066v1

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure; contribution presented at COSPAR Colloquium "Spectra & Timing of Compact X-ray Binaries," January 17-20, 20

Scientific paper

10.1016/j.asr.2005.10.056

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 lambda ~ 6000 Ang 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

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