ABRAMOWICZ, Marek and Jiří HORÁK. Alpha-Viscosity Effects in Slender Tori. Publications Of The Astronomical Society Of Japan. JP - Japonsko, 2012, vol. 64, No 4, 9 pp. ISSN 0004-6264. Available from: https://dx.doi.org/10.1093/pasj/64.4.76.
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Basic information
Original name Alpha-Viscosity Effects in Slender Tori
Authors ABRAMOWICZ, Marek and Jiří HORÁK.
Edition Publications Of The Astronomical Society Of Japan, JP - Japonsko, 2012, 0004-6264.
Other information
Original language English
Type of outcome Article in a journal
Field of Study 10308 Astronomy
Confidentiality degree is not subject to a state or trade secret
WWW URL
Organization unit Faculty of Philosophy and Science in Opava
Doi http://dx.doi.org/10.1093/pasj/64.4.76
UT WoS 000309296600013
Keywords in English Accretion disks; X-rays: binaries
Tags FÚ
Tags International impact, Reviewed
Changed by Changed by: Mgr. Pavlína Jalůvková, učo 25213. Changed: 15/4/2021 10:48.
Abstract
We explore effects of the Shakura-Sunyaev alpha-viscosity on the dynamics and oscillations of slender tori. We start with a slow secular evolution of the torus. We show that the angular-momentum profile approaches the Keplerian one on a timescale longerthan a dynamical one by a factor on the order of 1/alpha. We then focus our attention on the oscillations of the torus. We discuss the effects of various angular-momentum distributions. Using a perturbation theory, we have found a rather general result that the high-order acoustic modes are damped by the viscosity, while the high-order inertial modes are enhanced. We calculate viscous growth rates for the lowest-order modes, and show that already the lowest-order inertial mode is unstable for less-steepangular-momentum profiles, or very close to the central gravitating object.
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