Multicomponent radiatively driven stellar windsII. Gayley-Owocki heating in multitemperature winds of OB stars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216224%3A14310%2F01%3A00004405" target="_blank" >RIV/00216224:14310/01:00004405 - isvavai.cz</a>

Výsledek na webu

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DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Multicomponent radiatively driven stellar windsII. Gayley-Owocki heating in multitemperature winds of OB stars

Popis výsledku v původním jazyce

We show that the so-called Gayley-Owocki (Doppler) heating is important for the temperature structure of the wind of main sequence stars cooler than the spectral type O6. The formula for Gayley-Owocki heating is derived directly from the Boltzmann equation as a direct consequence of the dependence of the driving force on the velocity gradient. Since Gayley-Owocki heating deposits heat directly on the absorbing ions, we also investigated the possibility that individual components of the radiatively driven stellar wind have different temperatures. This effect is negligible in the wind of O stars, whereas a significant temperature difference takes place in the winds of main sequence B stars for stars cooler than B2. Typical temperature differences betweenabsorbing ions and other flow components for such stars is of the order 103 K. However, in the case when the passive component falls back onto the star, the absorbing component reaches temperatures of order 106 K, which allows for emissi

Název v anglickém jazyce

Multicomponent radiatively driven stellar windsII. Gayley-Owocki heating in multitemperature winds of OB stars

Popis výsledku anglicky

We show that the so-called Gayley-Owocki (Doppler) heating is important for the temperature structure of the wind of main sequence stars cooler than the spectral type O6. The formula for Gayley-Owocki heating is derived directly from the Boltzmann equation as a direct consequence of the dependence of the driving force on the velocity gradient. Since Gayley-Owocki heating deposits heat directly on the absorbing ions, we also investigated the possibility that individual components of the radiatively driven stellar wind have different temperatures. This effect is negligible in the wind of O stars, whereas a significant temperature difference takes place in the winds of main sequence B stars for stars cooler than B2. Typical temperature differences betweenabsorbing ions and other flow components for such stars is of the order 103 K. However, in the case when the passive component falls back onto the star, the absorbing component reaches temperatures of order 106 K, which allows for emissi

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BN - Astronomie a nebeská mechanika, astrofyzika

OECD FORD obor

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Projekt

<a href="/cs/project/GA205%2F01%2F0656" target="_blank" >GA205/01/0656: Modelování rozsáhlých obálek horkých hvězd</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2001

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název periodika

Astronomy and Astrophysics

ISSN

0004-6361

e-ISSN

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Svazek periodika

35

Číslo periodika v rámci svazku

377

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

17

Strana od-do

175

Kód UT WoS článku

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EID výsledku v databázi Scopus

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