Stability of a thin magnetized accretion disk surrounding a YSO with anomalous magnetic viscosity

The stability of a thin magnetized accretion disk surrounding a young stellar object (YSO) is numerically examined. Here we adopt a somewhat more physical viscosity prescription (anomalous magnetic viscosity) than previous authors did. Our results show that, under the short wavelength approximation...

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Bibliographic Details
Published in:Astrophysics and space science 2011-04, Vol.332 (2), p.379-384
Main Authors: Lin, Fu-Jun, Liu, San-Qiu
Format: Article
Language:English
Subjects:
Accretion
Astrobiology
Astronomy
Astrophysics
Astrophysics and Astroparticles
Cosmology
Magnetic fields
Observations and Techniques
Original Article
Physics
Physics and Astronomy
Space Exploration and Astronautics
Space Sciences (including Extraterrestrial Physics
Stars & galaxies
Viscosity
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Summary:The stability of a thin magnetized accretion disk surrounding a young stellar object (YSO) is numerically examined. Here we adopt a somewhat more physical viscosity prescription (anomalous magnetic viscosity) than previous authors did. Our results show that, under the short wavelength approximation ( kr ≫1), viscous and thermal modes are stable, while two magneto-acoustic modes are unstable. Particularly, for the unstable modes, the values of the growth rates are smaller in the outer region than ones in the inner. It means that the growth time scales for these instabilities in the inner region are shorter than in the outer, which maybe provide an explanation for fast burst.
ISSN:0004-640X
1572-946X
DOI:10.1007/s10509-010-0517-5