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Outbursts of irradiated accretion discs

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journal contribution
posted on 2019-10-02, 15:33 authored by A. R. King
I solve analytically the viscous evolution of an irradiated accretion disc, as seen during outbursts of soft X-ray transients. The solutions predict steep power-law X-ray decays LX ∼ (1 + t/tvisc)−4, changing to LX ∼ (1 − t/t′visc)4 at late times, where tvisc, t′visc are viscous time-scales. These forms closely resemble the approximate exponential and linear decays inferred by King and Ritter in these two regimes. The decays are much steeper than for unirradiated discs because the viscosity is a function of the central accretion rate rather than of local conditions in the disc.

Funding

I thank Hans Ritter, John Cannizzo and Henk Spruit for very helpful discussions, Graham Wynn for help with curve– fitting, and the U.K. Particle Physics and Astronomy Research Council for a Senior Fellowship. Theoretical astrophysics research at Leicester is supported by a PPARC Rolling Grant.

History

Citation

Monthly Notices of the Royal Astronomical Society, 1998, 296 (4), pp. L45-L50 (6)

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP), Royal Astronomical Society

issn

0035-8711

Acceptance date

1998-03-13

Copyright date

1998

Available date

2019-10-02

Publisher version

https://academic.oup.com/mnras/article/296/4/L45/1064882

Language

en

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