Hynes, R.I.; O'Brien, K; Horne, K.; Chen, W. and Haswell, C. A.
|DOI (Digital Object Identifier) Link:||http://dx.doi.org/10.1046/j.1365-8711.1998.01856.x|
|Google Scholar:||Look up in Google Scholar|
We demonstrate correlated rapid variability between the optical/UV and X-ray emission for the first time in a soft X-ray transient, GRO J1655–40: Hubble Space Telescope (HST) light curves show similar features to those seen by the Rossi X-ray Timing Explorer (RXTE), but with mean delay of up to 10–20 s. We interpret the correlations as the result of reprocessing of X-rays into optical and UV emission, with a delay owing to finite light travel time, and thus perform echo mapping of the system. The time-delay distribution has a mean of 14.6 ± 1.4 s and dispersion (i.e. the standard deviation of the distribution) of 10.5 ± 1.9 s at binary phase 0.4. Hence we identify the reprocessing region as the accretion disc rather than the mass donor star.
|Item Type:||Journal Article|
|Keywords:||accretion, accretion discs – binaries: close – stars: individual: Nova Sco 1994 (GRO J1655–40) – ultraviolet: stars – X-rays: stars.|
|Academic Unit/Department:||Science > Physical Sciences
|Interdisciplinary Research Centre:||Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)|
|Depositing User:||Astrid Peterkin|
|Date Deposited:||25 Jul 2008 11:21|
|Last Modified:||14 Jan 2016 17:02|
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