The Open UniversitySkip to content
 

Echoes from an irradiated disc in GRO J1655–40

Hynes, R.I.; O'Brien, K; Horne, K.; Chen, W. and Haswell, C. A. (1998). Echoes from an irradiated disc in GRO J1655–40. Monthly Notices of the Royal Astronomical Society, 299(4) L37-L41.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1046/j.1365-8711.1998.01856.x
Google Scholar: Look up in Google Scholar

Abstract

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
ISSN: 1365-2966
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)
Item ID: 11140
Depositing User: Astrid Peterkin
Date Deposited: 25 Jul 2008 11:21
Last Modified: 11 Jul 2013 15:25
URI: http://oro.open.ac.uk/id/eprint/11140
Share this page:

Actions (login may be required)

View Item
Report issue / request change

Policies | Disclaimer

© The Open University   + 44 (0)870 333 4340   general-enquiries@open.ac.uk