On the source of viscosity in cool binary accretion disks

Details On the source of viscosity in cool binary accretion disks On the source of viscosity in cool binary accretion disks

1999-01-18

arxiv.org/abs/astro-ph/9901232v1

Astron.Astrophys.341:L23-L26,1999

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures

Scientific paper

We suggest that the low viscosity in close binary accretion disks during quiescence is due to magnetic fields from the companion star. In very late evolutionary phase the companion stars become brown dwarfs and have cooled down to such low a temperature that this process cannot work anymore. The extremely low viscosity in WZ Sge stars supports this connection between companion stars and viscosity. We further suggest that magnetic activity in such very cool stars is cut off by their poor electric conductivity.

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