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

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00639899" target="_blank" >RIV/67985815:_____/25:00639899 - isvavai.cz</a>

Alternative codes found

RIV/00216224:14310/25:00143042

Result on the web

<a href="https://hdl.handle.net/11104/0370392" target="_blank" >https://hdl.handle.net/11104/0370392</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202556234" target="_blank" >10.1051/0004-6361/202556234</a>

Result language

angličtina

Original language name

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

Original language description

We provide new line-driven wind models for OB stars with metallicities down to 0.01 Z(circle dot). 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 less than or similar to 0.1 Z(circle dot). 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.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

<a href="/en/project/GA25-15910S" target="_blank" >GA25-15910S: Hot star winds: solving uncertainties of mass loss near the Eddington limit</a><br>

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2025

Confidentiality

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

Name of the periodical

Astronomy & Astrophysics

ISSN

0004-6361

e-ISSN

1432-0746

Volume of the periodical

702

Issue of the periodical within the volume

Sept.

Country of publishing house

FR - FRANCE

Number of pages

11

Pages from-to

A9

UT code for WoS article

001582547500010

EID of the result in the Scopus database

2-s2.0-105017761430