Dynamo driven accretion discs and dwarf nova eruptions

Details Dynamo driven accretion discs and dwarf nova eruptions Dynamo driven accretion discs and dwarf nova eruptions

1995-11-20

arxiv.org/abs/astro-ph/9511092v1

Astronomy and Astrophysics

Astrophysics

uu-encoded gz-compressed Postscript file, 18 pages including 6 figures. ApJ in press

Scientific paper

We explore the consequences of a magnetic dynamo origin for the viscosity in accretion discs, for the structure and evolution of discs in dwarf nova systems. We propose that the rapid cooling that sets in at the end of a dwarf nova eruption acts to inhibit the Balbus-Hawley instability, and thereby to quench dynamo action and so reduce disc viscosity. We demonstrate that a modified disc instability model can reproduce the basic properties of dwarf nova eruptions, as well as some properties of quiescent discs. We also discuss some observational consequences of our model.

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