Alpha-Viscosity Effects in Slender Tori

@article{43587,
   author = {Abramowicz, Marek and Horák, Jiří},
   article_location = {JP - Japonsko},
   article_number = {4},
   doi = {http://dx.doi.org/10.1093/pasj/64.4.76},
   keywords = {Accretion disks; X-rays: binaries},
   language = {eng},
   issn = {0004-6264},
   journal = {Publications Of The Astronomical Society Of Japan},
   title = {Alpha-Viscosity Effects in Slender Tori},
   url = {http://pasj.asj.or.jp/v64/n4/640076/640076.pdf},
   volume = {64},
   year = {2012}
}

TY  - JOUR
ID  - 43587
AU  - Abramowicz, Marek - Horák, Jiří
PY  - 2012
TI  - Alpha-Viscosity Effects in Slender Tori
JF  - Publications Of The Astronomical Society Of Japan
VL  - 64
IS  - 4
SN  - 00046264
KW  - Accretion disks
KW  - X-rays: binaries
UR  - http://pasj.asj.or.jp/v64/n4/640076/640076.pdf
N2  - 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.
ER  - 

ABRAMOWICZ, Marek a Jiří HORÁK. Alpha-Viscosity Effects in Slender Tori. \textit{Publications Of The Astronomical Society Of Japan}. JP - Japonsko, 2012, roč.~64, č.~4, 9 s. ISSN~0004-6264. Dostupné z: https://dx.doi.org/10.1093/pasj/64.4.76.