Hydrodynamical Modeling of Large Circumstellar Disks

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Publikace nespadá pod Filozofickou fakultu, ale pod Přírodovědeckou fakultu. Oficiální stránka publikace je na webu muni.cz.
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KURFÜRST Petr KRTIČKA Jiří

Rok publikování 2016
Druh Článek ve sborníku
Konference Bright Emissaries: Be Stars as Messengers of Star-Disk Physics
Fakulta / Pracoviště MU

Přírodovědecká fakulta

Citace
Obor Astronomie a nebeská mechanika, astrofyzika
Klíčová slova large decretion disks critical point outer disk radius
Popis Direct centrifugal ejection from a critically or near-critically rotating surface forms a gaseous equatorial decretion disk. Anomalous viscosity provides the efficient mechanism for transporting the angular momentum outwards. The outer part of the disk can extend up to a very large distance from the parent star. We study the evolution of density, radial and azimuthal velocity, and angular momentum loss rate of equatorial decretion disks out to very distant regions. We investigate how the physical characteristics of the disk depend on the distribution of temperature and viscosity. We also study the magnetorotational instability, which is considered to be the origin of anomalous viscosity in outflowing disks. We use analytical calculations to study the stability of outflowing disks submerged to the magnetic field. At large radii the instability disappears in the region where the disk orbital velocity is roughly equal to the sound speed. Therefore, the disk sonic radius can be roughly considered as an outer disk radius.
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