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Astron. Astrophys. 344, 639-646 (1999)

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Discs gone with the wind?

G. Shaviv 1, D. Wickramasinghe 2 and R. Wehrse 3

1 Asher Space Research Institute and Department of Physics Israel Institute of Technology, 32,000 Haifa, Israel
2 Astrophysical Theory Centre, The Australian National University, Canberra, Australia
3 Institute for Theoretical Astrophysics Tiergartenstrasse 15, D-69120 Heidelberg, Germany

Received 1 October 1998 / Accepted 24 December 1998

Abstract

We examine the conditions imposed on the vertical structure of accretion discs for them to exist. We find that a wind powered by a thermal instability exists in all discs with certain opacity laws. We find that for discs dominated by bremsstrahlung radiation, an inner hole develops below a certain accretion rate, and that for very low accretion rates, discs may not form at all. The consequences of our results are discussed in relation to black hole soft x-ray transient (BHSXT) accretion discs, and accretion discs in other systems.

Key words: accretion, accretion disks – stars: binaries: close – stars: circumstellar matter – stars: white dwarfs – X-rays: stars

Send offprint requests to: G. Shaviv

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© European Southern Observatory (ESO) 1999

Online publication: March 18, 1999
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