An `outside-in' outburst of AQL X-1

Bibcode
1998MNRAS.300.1035S
DOI
10.1046/j.1365-8711.1998.01965.x
Shahbaz, T.; Bandyopadhyay, R. M.; Charles, P. A.; Wagner, R. M.; Muhli, P.; Hakala, P.; Casares, J.; Greenhill, J.
Bibliographical reference

Monthly Notices of the Royal Astronomical Society, Volume 300, Issue 4, pp. 1035-1040.

Advertised on:
11
1998
Journal
Monthly Notices of the Royal Astronomical Society
Number of authors
8
IAC number of authors
1
Citations
29
Refereed citations
25
Description
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.
Type
Refereed
Accretion

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