Light variations due to the line-driven wind instability and
wind blanketing in O stars

J 2018

Light variations due to the line-driven wind instability and wind blanketing in O stars

KRTIČKA, Jiří a Achim FELDMEIER

Základní údaje

Originální název

Light variations due to the line-driven wind instability and wind blanketing in O stars

Název česky

Světelná proměnnost hvězd typu O v důsledku nestability čarami urychlovaného větru a větrného pokrývkového jevu

Autoři

KRTIČKA, Jiří (203 Česká republika, garant, domácí) a Achim FELDMEIER (276 Německo)

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2018, 1432-0746

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: 6.209

Kód RIV

RIV/00216224:14310/18:00101442

Organizační jednotka

Přírodovědecká fakulta

DOI

http://dx.doi.org/10.1051/0004-6361/201731614

UT WoS

000445860500001

Klíčová slova anglicky

stars: winds outflows; stars: mass-loss; stars: early-type; stars: variables: general; hydrodynamics

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 17. 12. 2018 23:41, prof. Mgr. Jiří Krtička, Ph.D.

Anotace

ORIG CZ

V originále

A small fraction of the radiative flux emitted by hot stars is absorbed by their winds and redistributed towards longer wavelengths. This effect, which leads also to the heating of the stellar photosphere, is termed wind blanketing. For stars with variable winds, the effect of wind blanketing may lead to the photometric variability. We have studied the consequences of line driven wind instability and wind blanketing for the light variability of O stars. We combined the results of wind hydrodynamic simulations and of global wind models to predict the light variability of hot stars due to the wind blanketing and instability. The wind instability causes stochastic light variability with amplitude of the order of tens of millimagnitudes and a typical timescale of the order of hours for spatially coherent wind structure. The amplitude is of the order of millimagnitudes when assuming that the wind consists of large number of independent concentric cones. The variability with such amplitude is observable using present space borne photometers. We show that the simulated light curve is similar to the light curves of O stars obtained using BRITE and CoRoT satellites.

Česky

Malá část toku záření emitovaného hvězdou je absorbována větry a přerozdělena směrem k větším vlnovým délkám. Pro hvězdy s proměnnými větry může tento jev vést ke světelné proměnnosti. Studujeme důsledky proměnnosti větru na fotometrickou proměnnost hvězd typu O. Tento jev je schopen vysvětlit stochastickou proměnnost pozorovanou pomocí družic.

Návaznosti

GA16-01116S, projekt VaV

Název: Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Investor: Grantová agentura ČR, Atmosféry a okolohvězdné prostředí magnetických horkých hvězd

Citovat

KRTIČKA, Jiří a Achim FELDMEIER. Light variations due to the line-driven wind instability and wind blanketing in O stars. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2018, roč. 617, léto, s. "A121-1"-"A212-7", 7 s. ISSN 1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201731614.

@article{1479476,
   author = {Krtička, Jiří and Feldmeier, Achim},
   article_location = {LES ULIS CEDEX A},
   article_number = {léto},
   doi = {http://dx.doi.org/10.1051/0004-6361/201731614},
   keywords = {stars: winds outflows; stars: mass-loss; stars: early-type; stars: variables: general; hydrodynamics},
   language = {eng},
   issn = {1432-0746},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {Light variations due to the line-driven wind instability and wind blanketing in O stars},
   url = {http://adsabs.harvard.edu/abs/2018A%26A...617A.121K},
   volume = {617},
   year = {2018}
}

TY  - JOUR
ID  - 1479476
AU  - Krtička, Jiří - Feldmeier, Achim
PY  - 2018
TI  - Light variations due to the line-driven wind instability and wind blanketing in O stars
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 617
IS  - léto
SP  - "A121-1"-"A212-7"
EP  - "A121-1"-"A212-7"
PB  - EDP SCIENCES S A
SN  - 14320746
KW  - stars: winds outflows
KW  - stars: mass-loss
KW  - stars: early-type
KW  - stars: variables: general
KW  - hydrodynamics
UR  - http://adsabs.harvard.edu/abs/2018A%26A...617A.121K
N2  - A small fraction of the radiative flux emitted by hot stars is absorbed by their winds and redistributed towards longer wavelengths. This effect, which leads also to the heating of the stellar photosphere, is termed wind blanketing. For stars with variable winds, the effect of wind blanketing may lead to the photometric variability. We have studied the consequences of line driven wind instability and wind blanketing for the light variability of O stars. We combined the results of wind hydrodynamic simulations and of global wind models to predict the light variability of hot stars due to the wind blanketing and instability. The wind instability causes stochastic light variability with amplitude of the order of tens of millimagnitudes and a typical timescale of the order of hours for spatially coherent wind structure. The amplitude is of the order of millimagnitudes when assuming that the wind consists of large number of independent concentric cones. The variability with such amplitude is observable using present space borne photometers. We show that the simulated light curve is similar to the light curves of O stars obtained using BRITE and CoRoT satellites.
ER  -

KRTIČKA, Jiří a Achim FELDMEIER. Light variations due to the line-driven wind instability and wind blanketing in O stars. \textit{ASTRONOMY \&{}amp; ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2018, roč.~617, léto, s.~''A121-1''-''A212-7'', 7 s. ISSN~1432-0746. Dostupné z: https://dx.doi.org/10.1051/0004-6361/201731614.

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