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@article{2385859,
author = {Krtička, Jiří and Kubát, Jiří and Krtičková, Iva},
article_number = {January 2024},
doi = {http://dx.doi.org/10.1051/0004-6361/202347916},
keywords = {stars: winds; outflows; stars: mass-loss; stars: early-type; supergiants; hydrodynamics; Magellanic Clouds},
language = {eng},
issn = {0004-6361},
journal = {Astronomy and Astrophysics},
title = {New mass-loss rates of Magellanic Cloud B supergiants from global wind models},
url = {https://arxiv.org/pdf/2311.01257.pdf},
volume = {681},
year = {2024}
}
TY - JOUR
ID - 2385859
AU - Krtička, Jiří - Kubát, Jiří - Krtičková, Iva
PY - 2024
TI - New mass-loss rates of Magellanic Cloud B supergiants from global wind models
JF - Astronomy and Astrophysics
VL - 681
IS - January 2024
SP - 1-8
EP - 1-8
PB - EDP Sciences
SN - 00046361
KW - stars: winds
KW - outflows
KW - stars: mass-loss
KW - stars: early-type
KW - supergiants
KW - hydrodynamics
KW - Magellanic Clouds
UR - https://arxiv.org/pdf/2311.01257.pdf
N2 - We provide global models of line-driven winds of B supergiants for metallicities corresponding to the Large and Small Magellanic Clouds. The velocity and density structure of the models is determined consistently from hydrodynamical equations with radiative force derived in the comoving frame and level populations computed from kinetic equilibrium equations. We provide a formula expressing the predicted mass-loss rates in terms of stellar luminosity, effective temperature, and metallicity. Predicted wind mass-loss rates decrease with decreasing metallicity as (M) over dot similar to Z(0.60) and are proportional to the stellar luminosity. The mass-loss rates increase below the region of the bistability jump at about 20 kK because of iron recombination. In agreement with previous theoretical and observational studies, we find a smooth change of wind properties in the region of the bistability jump. With decreasing metallicity, the bistability jump becomes weaker and shifts to lower effective temperatures. At lower metallicities above the bistability jump, our predictions provide similar rates to those used in current evolutionary models, but our rates are significantly lower than older predictions below the bistability jump. Our predicted mass-loss rates agree with observational estimates derived from H alpha line assuming that observations of stellar winds from Galaxy and the Magellanic Clouds are uniformly affected by clumping. The models nicely reproduce the dependence of terminal velocities on temperature derived from ultraviolet spectroscopy.
ER -
KRTIČKA, Jiří, Jiří KUBÁT a Iva KRTIČKOVÁ. New mass-loss rates of Magellanic Cloud B supergiants from global wind models. \textit{Astronomy and Astrophysics}. EDP Sciences, 2024, roč.~681, January 2024, s.~1-8. ISSN~0004-6361. Dostupné z: https://dx.doi.org/10.1051/0004-6361/202347916.
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