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An 'outside-in' outburst of Aql X-1


Shahbaz, T and Bandyopadhyay, RM and Charles, PA and Wagner, RM and Muhli, P and Hakala, P and Casares, J and Greenhill, JG, An 'outside-in' outburst of Aql X-1, Monthly Notices of the Royal Astronomical Society, 300, (4) pp. 1035-1040. ISSN 0035-8711 (1998) [Refereed Article]

DOI: doi:10.1046/j.1365-8711.1998.t01-1-01965.x


We present optical spectroscopy and optical and infrared photometry of the neutron star soft X-ray transient Aql X-1 during its X-ray outburst of 1997 August. By modelling the X-ray, optical and IR light curves, we find a 3-d delay between the IR and X-ray rise times, analogous to the UV-optical delay seen in dwarf novae outbursts and black hole X-ray transients. We interpret this delay as the signature of an 'outside-in' outburst, in which a thermal instability in the outer disc propagates inward. This outburst is the first of this type definitively identified in a neutron star X-ray transient.

Item Details

Item Type:Refereed Article
Research Division:Physical Sciences
Research Group:Astronomical sciences
Research Field:Galactic astronomy
Objective Division:Expanding Knowledge
Objective Group:Expanding knowledge
Objective Field:Expanding knowledge in the physical sciences
UTAS Author:Greenhill, JG (Dr John Greenhill)
ID Code:36115
Year Published:1998
Web of Science® Times Cited:27
Deposited By:Physics
Deposited On:2005-08-01
Last Modified:2011-08-10

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