About: Alpha-Viscosity Effects in Slender Tori

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An Entity of Type : http://linked.opendata.cz/ontology/domain/vavai/Vysledek, within Data Space : linked.opendata.cz associated with source document(s)

Attributes	Values
rdf:type	skos:Concept http://linked.opendata.cz/ontology/domain/vavai/Vysledek
rdfs:seeAlso	http://pasj.asj.or.jp/v64/n4/640076/640076.pdf
Description	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 longer than 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-steep angular-momentum profiles, or very close to the central gravitating object. 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 longer than 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-steep angular-momentum profiles, or very close to the central gravitating object. (en)
Title	Alpha-Viscosity Effects in Slender Tori Alpha-Viscosity Effects in Slender Tori (en)
skos:prefLabel	Alpha-Viscosity Effects in Slender Tori Alpha-Viscosity Effects in Slender Tori (en)
skos:notation	RIV/47813059:19240/12:#0004587!RIV13-MSM-19240___
http://linked.open...avai/riv/aktivita	I O P
http://linked.open...avai/riv/aktivity	I, O, P(GAP209/11/2004)
http://linked.open...iv/cisloPeriodika	4
http://linked.open...vai/riv/dodaniDat	2013
http://linked.open...aciTvurceVysledku	Abramowicz, Marek
http://linked.open.../riv/druhVysledku	J - Článek v odborném periodiku
http://linked.open...iv/duvernostUdaju	S - Úplné a pravdivé údaje nepodléhající ochraně podle zvláštních právních předpisů
http://linked.open...titaPredkladatele	Slezská univerzita v Opavě / Filozoficko-přírodovědecká fakulta
http://linked.open...dnocenehoVysledku	121739
http://linked.open...ai/riv/idVysledku	RIV/47813059:19240/12:#0004587
http://linked.open...riv/jazykVysledku	eng - angličtina
http://linked.open.../riv/klicovaSlova	Accretion disks; X-rays: binaries (en)
http://linked.open.../riv/klicoveSlovo	Accretion disks X-rays: binaries
http://linked.open...odStatuVydavatele	JP - Japonsko
http://linked.open...ontrolniKodProRIV	[131180E950A7]
http://linked.open...i/riv/nazevZdroje	Publications Of The Astronomical Society Of Japan
http://linked.open...in/vavai/riv/obor	BN
http://linked.open...ichTvurcuVysledku	1 (xsd:int)
http://linked.open...cetTvurcuVysledku	5 (xsd:int)
http://linked.open...vavai/riv/projekt	Oscillations of magnetized accretion disks
http://linked.open...UplatneniVysledku	2012
http://linked.open...v/svazekPeriodika	64
http://linked.open...iv/tvurceVysledku	Abramowicz, Marek Horak, J.
http://linked.open...ain/vavai/riv/wos	000309296600013
issn	0004-6264
number of pages	9 (xsd:int)
http://localhost/t...ganizacniJednotka	19240

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