New line-driven wind mass-loss rates for OB stars with
metallicities down to 0.01 Z⊙

J 2025

New line-driven wind mass-loss rates for OB stars with metallicities down to 0.01 Z⊙

KRTIČKA, Jiří; Jiří KUBÁT a Iva KRTIČKOVÁ

Základní údaje

Originální název

New line-driven wind mass-loss rates for OB stars with metallicities down to 0.01 Z⊙

Autoři

KRTIČKA, Jiří; Jiří KUBÁT a Iva KRTIČKOVÁ

Vydání

ASTRONOMY & ASTROPHYSICS, LES ULIS CEDEX A, EDP SCIENCES S A, 2025, 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: 5.800 v roce 2024

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/25:00143042

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova anglicky

stars: early-type; stars: mass-loss; supergiants; stars: winds; outflows; Local Group; Magellanic Clouds

Štítky

14312040, rivok

Příznaky

Mezinárodní význam, Recenzováno

Změněno: 2. 1. 2026 10:14, Mgr. Marie Novosadová Šípková, DiS.

Anotace

V originále

We provide new line-driven wind models for OB stars with metallicities down to 0.01 Z⊙. The models were calculated with our global wind code METUJE, which solves the hydrodynamical equations from nearly hydrostatic photosphere to supersonically expanding stellar wind together with the equations of statistical equilibrium and the radiative transfer equation. The models predict the basic wind parameters, namely, the wind mass-loss rates and terminal velocities just from the stellar parameters. In general, the wind mass-loss rates decrease with decreasing metallicity and this relationship steepens for very low metallicities, Z ≲ 0.1 Z⊙. Down to metallicities corresponding to the Magellanic Clouds and even lower, the predicted mass-loss rates reasonably agree with observational estimates. However, the theoretical and observational mass-loss rates for very low metallicities exhibit significant scatter. We show that the scatter of observational values can be caused by inefficient shock cooling in the stellar wind, which leaves a considerable fraction of the wind at too high temperatures with waning observational signatures. The scatter of theoretical predictions is caused by a low number of lines that effectively accelerate the wind at very low metallicities.

Návaznosti

GA25-15910S, projekt VaV

Název: Větry horkých hvězd: řešení nejistot ztráty hmoty v blízkosti Eddingtonovy limity

Investor: Grantová agentura ČR, Větry horkých hvězd: řešení nejistot ztráty hmoty v blízkosti Eddingtonovy limity

90254, velká výzkumná infrastruktura

Název: e-INFRA CZ II

Přiložené soubory

2543360.pdf

Citovat

KRTIČKA, Jiří; Jiří KUBÁT a Iva KRTIČKOVÁ. New line-driven wind mass-loss rates for OB stars with metallicities down to 0.01 Z⊙. ASTRONOMY & ASTROPHYSICS. LES ULIS CEDEX A: EDP SCIENCES S A, 2025, roč. 702, October, s. "A9", 11 s. ISSN 0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/202556234.

@article{2543360,
   author = {Krtička, Jiří and Kubát, Jiří and Krtičková, Iva},
   article_location = {LES ULIS CEDEX A},
   article_number = {October},
   doi = {https://doi.org/10.1051/0004-6361/202556234},
   keywords = {stars: early-type; stars: mass-loss; supergiants; stars: winds; outflows; Local Group; Magellanic Clouds},
   language = {eng},
   issn = {0004-6361},
   journal = {ASTRONOMY & ASTROPHYSICS},
   title = {New line-driven wind mass-loss rates for OB stars with metallicities down to 0.01 Z⊙},
   url = {https://doi.org/10.1051/0004-6361/202556234},
   volume = {702},
   year = {2025}
}

TY  - JOUR
ID  - 2543360
AU  - Krtička, Jiří - Kubát, Jiří - Krtičková, Iva
PY  - 2025
TI  - New line-driven wind mass-loss rates for OB stars with metallicities down to 0.01 Z⊙
JF  - ASTRONOMY & ASTROPHYSICS
VL  - 702
IS  - October
SP  - "A9"
EP  - "A9"
PB  - EDP SCIENCES S A
SN  - 00046361
KW  - stars: early-type
KW  - stars: mass-loss
KW  - supergiants
KW  - stars: winds
KW  - outflows
KW  - Local Group
KW  - Magellanic Clouds
UR  - https://doi.org/10.1051/0004-6361/202556234
N2  - We provide new line-driven wind models for OB stars with metallicities down to 0.01 Z⊙. The models were calculated with our global wind code METUJE, which solves the hydrodynamical equations from nearly hydrostatic photosphere to supersonically expanding stellar wind together with the equations of statistical equilibrium and the radiative transfer equation. The models predict the basic wind parameters, namely, the wind mass-loss rates and terminal velocities just from the stellar parameters. In general, the wind mass-loss rates decrease with decreasing metallicity and this relationship steepens for very low metallicities, Z ≲ 0.1 Z⊙. Down to metallicities corresponding to the Magellanic Clouds and even lower, the predicted mass-loss rates reasonably agree with observational estimates. However, the theoretical and observational mass-loss rates for very low metallicities exhibit significant scatter. We show that the scatter of observational values can be caused by inefficient shock cooling in the stellar wind, which leaves a considerable fraction of the wind at too high temperatures with waning observational signatures. The scatter of theoretical predictions is caused by a low number of lines that effectively accelerate the wind at very low metallicities.
ER  -

KRTIČKA, Jiří; Jiří KUBÁT a Iva KRTIČKOVÁ. New line-driven wind mass-loss rates for OB stars with metallicities down to 0.01 Z⊙. \textit{ASTRONOMY \&{} ASTROPHYSICS}. LES ULIS CEDEX A: EDP SCIENCES S A, 2025, roč.~702, October, s.~''A9'', 11 s. ISSN~0004-6361. Dostupné z: https://doi.org/10.1051/0004-6361/202556234.

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