X-Shooting ULLYSES: Massive stars at low metallicity: X. Physical parameters and feedback of massive stars in the LMC N11 B star-forming region

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985815%3A_____%2F25%3A00618570" target="_blank" >RIV/67985815:_____/25:00618570 - isvavai.cz</a>

Result on the web

<a href="https://hdl.handle.net/11104/0366073" target="_blank" >https://hdl.handle.net/11104/0366073</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1051/0004-6361/202451366" target="_blank" >10.1051/0004-6361/202451366</a>

Result language

angličtina

Original language name

X-Shooting ULLYSES: Massive stars at low metallicity: X. Physical parameters and feedback of massive stars in the LMC N11 B star-forming region

Original language description

Massive stars drive the ionization and mechanical feedback within young star-forming regions. The Large Magellanic Cloud (LMC) is an ideal galaxy for studying individual massive stars and quantifying their feedback contribution to the environment. We analyze eight exemplary targets in LMC N11 B from the Hubble UV Legacy Library of Young Stars as Essential Standards (ULLYSES) program using novel spectra from HST (COS and STIS) in the UV, and from VLT (X-shooter) in the optical. We model the spectra of early to late O-type stars using state-of-the-art PoWR atmosphere models. We determine the stellar and wind parameters (e.g., T-star, log g, L-star, M, and v(infinity)) of the analyzed objects, chemical abundances (C, N, and O), ionizing and mechanical feedback (Q(H), Q(HeI), Q(He II), and L-mec), and X-rays. We report ages of 2-4.5 Myr and masses of 30-60 M-circle dot for the analyzed stars in N11 B, which are consistent with a scenario of sequential star formation. We note that the observed wind-momentum-luminosity relation is consistent with theoretical predictions. We detect nitrogen enrichment by up to a factor of seven in most of the stars. However, we do not find a correlation between nitrogen enrichment and projected rotational velocity. Finally, based on their spectral type, we estimate the total ionizing photons injected from the O-type stars in N11 B into its environment. We report log (Sigma Q(H)) = 50.5 ph s(-1), log (Sigma Q(He I)) = 49.6 ph s(-1), and log (Sigma Q(He II))= 44.4 ph s(-1), consistent with the total ionizing budget in N11.

Czech name

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Czech description

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Type

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

CEP classification

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OECD FORD branch

10308 - Astronomy (including astrophysics,space science)

Project

—

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

695

Issue of the periodical within the volume

March

Country of publishing house

FR - FRANCE

Number of pages

18

Pages from-to

A197

UT code for WoS article

001448085200006

EID of the result in the Scopus database

2-s2.0-105000992265