Dynamo driven accretion discs and dwarf nova eruptions
Astrophysics
2016-01-27 v1
Abstract
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.
Keywords
Cite
@article{arxiv.astro-ph/9511092,
title = {Dynamo driven accretion discs and dwarf nova eruptions},
author = {P. J. Armitage and M. Livio and J. E. Pringle},
journal= {arXiv preprint arXiv:astro-ph/9511092},
year = {2016}
}
Comments
uu-encoded gz-compressed Postscript file, 18 pages including 6 figures. ApJ in press