Multicomponent radiatively driven stellar winds I.Nonisothermal
three-component wind of hot B stars

J 2001

Multicomponent radiatively driven stellar winds I.Nonisothermal three-component wind of hot B stars

KRTIČKA, Jiří a Jiří KUBÁT

Základní údaje

Originální název

Multicomponent radiatively driven stellar winds I.Nonisothermal three-component wind of hot B stars

Autoři

KRTIČKA, Jiří (203 Česká republika, garant) a Jiří KUBÁT

Vydání

Astronomy and Astrophysics, Les Ulis Cedex, France, EDP Sciences, 2001, 0004-6361

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10308 Astronomy

Stát vydavatele

Francie

Utajení

není předmětem státního či obchodního tajemství

Odkazy

URL

Impakt faktor

Impact factor: 2.790 v roce 2000

Kód RIV

RIV/00216224:14310/01:00004112

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

hydrodynamics -- stars: mass-loss -- stars: early-type -- stars: winds -- stars: individual: tau Sco

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 5. 3. 2007 17:57, prof. Mgr. Jiří Krtička, Ph.D.

Anotace

V originále

We computed models of a three-component nonisothermal radiatively driven stellar wind for different spectral types of hot B stars. We showed that friction heats mainly the outer parts of the wind and the modified temperature stratification leads to a decrease of the outflow velocity. Contrary to the isothermal case, even the possibility of decoupling of radiatively absorbing ions and (major) nonabsorbing component is excluded for a realistic form of the driving force. Regardless of the actual form of the driving force, we derived general conditions under which decoupling of a stellar wind may occur. We demonstrated that the possibility of decoupling is closely related to the functional dependence of the driving force and to the ratio of the densities of individual components. We discuss several consequences of a multifluid phenomenon in hot star winds, particularly metallicity effects and the implications of possible helium decoupling on chemically peculiar stars. We propose an explanation of the low terminal velocity of tau Sco based on frictional heating.

Návaznosti

GA205/01/0656, projekt VaV

Název: Modelování rozsáhlých obálek horkých hvězd

Citovat

KRTIČKA, Jiří a Jiří KUBÁT. Multicomponent radiatively driven stellar winds I.Nonisothermal three-component wind of hot B stars. Astronomy and Astrophysics. Les Ulis Cedex, France: EDP Sciences, 2001, roč. 35, č. 369, s. 222-238. ISSN 0004-6361.

@article{358891,
   author = {Krtička, Jiří and Kubát, Jiří},
   article_location = {Les Ulis Cedex, France},
   article_number = {369},
   keywords = {hydrodynamics -- stars: mass-loss -- stars: early-type -- stars: winds -- stars: individual: tau Sco},
   language = {eng},
   issn = {0004-6361},
   journal = {Astronomy and Astrophysics},
   title = {Multicomponent radiatively driven stellar winds I.Nonisothermal three-component wind of hot B stars},
   url = {http://www.edpsciences.com/articles/aa/abs/2001/13/aa10271/aa10271.html},
   volume = {35},
   year = {2001}
}

TY  - JOUR
ID  - 358891
AU  - Krtička, Jiří - Kubát, Jiří
PY  - 2001
TI  - Multicomponent radiatively driven stellar winds I.Nonisothermal three-component wind of hot B stars
JF  - Astronomy and Astrophysics
VL  - 35
IS  - 369
SP  - 222
EP  - 222
PB  - EDP Sciences
SN  - 00046361
KW  - hydrodynamics -- stars: mass-loss -- stars: early-type -- stars: winds -- stars: individual: tau Sco
UR  - http://www.edpsciences.com/articles/aa/abs/2001/13/aa10271/aa10271.html
N2  - We computed models of a three-component nonisothermal radiatively driven stellar wind for different spectral types of hot B stars. We showed that friction heats mainly the outer parts of the wind and the modified temperature stratification leads to a decrease of the outflow velocity. Contrary to the isothermal case, even the possibility of decoupling of radiatively absorbing ions and (major) nonabsorbing component is excluded for a realistic form of the driving force. Regardless of the actual form of the driving force, we derived general conditions under which decoupling of a stellar wind may occur. We demonstrated that the possibility of decoupling is closely related to the functional dependence of the driving force and to the ratio of the densities of individual components. We discuss several consequences of a multifluid phenomenon in hot star winds, particularly metallicity effects and the implications of possible helium decoupling on chemically peculiar stars. We propose an explanation of the low terminal velocity of tau Sco based on frictional heating.
ER  -

KRTIČKA, Jiří a Jiří KUBÁT. Multicomponent radiatively driven stellar winds I.Nonisothermal three-component wind of hot B stars. \textit{Astronomy and Astrophysics}. Les Ulis Cedex, France: EDP Sciences, 2001, roč.~35, č.~369, s.~222-238. ISSN~0004-6361.

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