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Observations of the quiescent x-ray transients GRS 1124-684 (=GU Mus) and Cen x-4 (=V822 Cen) taken with ULTRACAM on the VLT
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Shahbaz, T., Dhillon, V. S., Marsh, T. R., Casares, J., Zurita, C. and Charles, P. A.. (2010) Observations of the quiescent x-ray transients GRS 1124-684 (=GU Mus) and Cen x-4 (=V822 Cen) taken with ULTRACAM on the VLT. Monthly Notices of the Royal Astronomical Society, Vol.403 (No.4). pp. 2167-2175. ISSN 0035-8711
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Official URL: http://dx.doi.org/10.1111/j.1365-2966.2010.16262.x
Abstract
We present high time-resolution multicolour optical observations of the quiescent X-ray transients GRS 1124-684 (=GU Mus) and Cen X-4 (=V822 Cen) obtained with ULTRACAM. Superimposed on the secondary stars' ellipsoidal modulation in both objects are large flares on time-scales of 30-60 min as well as several distinct rapid flares on time-scales of a few minutes, most of which show further variability and unresolved structure. Not significant quasi-periodic oscillations are observed and the power density spectra of GRS 1124-684 and Cen X-4 can be described by a power law. From the colour-colour diagrams of the flare events, for GRS 1124-684 we find that the flares can be described by hydrogen gas with a density of N-H similar to 1024 nucleons cm(-2), a temperature of similar to 8000 K and arising from a radius of similar to 0.3 R-circle dot. Finally we compile the values for the transition radius (the radius of the hot advection-dominated accretion flow) estimated from quasi-periodic oscillations and/or breaks in the power density spectrum for a variety of X-ray transients in different X-ray states. As expected, we find a strong correlation between the bolometric luminosity and the transition radius.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QB Astronomy |
| Divisions: | Faculty of Science > Physics |
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society |
| Publisher: | Wiley |
| ISSN: | 0035-8711 |
| Date: | 21 April 2010 |
| Volume: | Vol.403 |
| Number: | No.4 |
| Number of Pages: | 9 |
| Page Range: | pp. 2167-2175 |
| Identification Number: | 10.1111/j.1365-2966.2010.16262.x |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| Funder: | Spanish Ministry of Science and Technology, Spanish MEC, STFC |
| Grant number: | AYA2007-66887, CSD2006-00070, PP/D002370/1 |
| URI: | http://wrap.warwick.ac.uk/id/eprint/6104 |
Data sourced from Thomson Reuters' Web of Knowledge
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