Hydrodynamical Modeling of Large Circumstellar Disks

D 2016

Hydrodynamical Modeling of Large Circumstellar Disks

KURFÜRST, Petr a Jiří KRTIČKA

Základní údaje

Originální název

Hydrodynamical Modeling of Large Circumstellar Disks

Autoři

KURFÜRST, Petr a Jiří KRTIČKA

Vydání

Volume 506. San Francisco, USA, Bright Emissaries: Be Stars as Messengers of Star-Disk Physics, od s. 149-156, 8 s. 2016

Nakladatel

Astronomical Society of the Pacific

Další údaje

Jazyk

angličtina

Typ výsledku

Stať ve sborníku

Obor

10308 Astronomy

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Forma vydání

elektronická verze "online"

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/16:00088337

Organizační jednotka

Přírodovědecká fakulta

ISBN

978-1-58381-896-1

UT WoS

000398425400019

Klíčová slova anglicky

large decretion disks critical point outer disk radius

Příznaky

Mezinárodní význam

Změněno: 27. 9. 2017 15:53, Mgr. Ing. arch. Petr Kurfürst, Ph.D.

Anotace

V originále

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.

Návaznosti

GA13-10589S, projekt VaV

Název: Ztráta hmoty horkých hmotných hvězd

Investor: Grantová agentura ČR, Ztráta hmoty horkých hmotných hvězd

Citovat

KURFÜRST, Petr a Jiří KRTIČKA. Hydrodynamical Modeling of Large Circumstellar Disks. Online. In Aaron Sigut, Carol Jones. Bright Emissaries: Be Stars as Messengers of Star-Disk Physics. Volume 506. San Francisco, USA: Astronomical Society of the Pacific, 2016, s. 149-156. ISBN 978-1-58381-896-1.

@inproceedings{1360626,
   author = {Kurfürst, Petr and Krtička, Jiří},
   address = {San Francisco, USA},
   booktitle = {Bright Emissaries: Be Stars as Messengers of Star-Disk Physics},
   edition = {Volume 506},
   editor = {Aaron Sigut, Carol Jones},
   keywords = {large decretion disks critical point outer disk radius},
   howpublished = {elektronická verze "online"},
   language = {eng},
   location = {San Francisco, USA},
   isbn = {978-1-58381-896-1},
   pages = {149-156},
   publisher = {Astronomical Society of the Pacific},
   title = {Hydrodynamical Modeling of Large Circumstellar Disks},
   year = {2016}
}

TY  - CONF
ID  - 1360626
AU  - Kurfürst, Petr - Krtička, Jiří
PY  - 2016
TI  - Hydrodynamical Modeling of Large Circumstellar Disks
PB  - Astronomical Society of the Pacific
CY  - San Francisco, USA
SN  - 9781583818961
KW  - large decretion disks critical point outer disk radius
N2  - 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.
ER  -

KURFÜRST, Petr a Jiří KRTIČKA. Hydrodynamical Modeling of Large Circumstellar Disks. Online. In Aaron Sigut, Carol Jones. \textit{Bright Emissaries: Be Stars as Messengers of Star-Disk Physics}. Volume 506. San Francisco, USA: Astronomical Society of the Pacific, 2016, s.~149-156. ISBN~978-1-58381-896-1.

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