X-Shooting ULLYSES: Massive Stars at Low Metallicity X. Physical Parameters and Feedback of Massive Stars in the LMC N11 B Star-Forming Region

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Main Authors:	Gómez-González, V. M. A., Oskinova, L. M., Hamann, W. -R., Todt, H., Pauli, D., Serantes, S. Reyero, Bernini-Peron, M., Sander, A. C., Ramachandran, V., Vink, J. S., Crowther, P. A., Berlanas, S. R., ud-Doula, A., Gormaz-Matamala, A. C., Kehrig, C., Kuiper, R., Leitherer, C., Mahy, L., McLeod, A. F., Mehner, A., Morrell, N., Shenar, T., Telford, O. G., van Loon, J. Th., Tramper, F., Wofford, A.
Format:	Preprint
Published:	2024
Subjects:	Solar and Stellar Astrophysics Astrophysics of Galaxies
Online Access:	Acceder al recurso
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author	Gómez-González, V. M. A. Oskinova, L. M. Hamann, W. -R. Todt, H. Pauli, D. Serantes, S. Reyero Bernini-Peron, M. Sander, A. C. Ramachandran, V. Vink, J. S. Crowther, P. A. Berlanas, S. R. ud-Doula, A. Gormaz-Matamala, A. C. Kehrig, C. Kuiper, R. Leitherer, C. Mahy, L. McLeod, A. F. Mehner, A. Morrell, N. Shenar, T. Telford, O. G. van Loon, J. Th. Tramper, F. Wofford, A.
author_facet	Gómez-González, V. M. A. Oskinova, L. M. Hamann, W. -R. Todt, H. Pauli, D. Serantes, S. Reyero Bernini-Peron, M. Sander, A. C. Ramachandran, V. Vink, J. S. Crowther, P. A. Berlanas, S. R. ud-Doula, A. Gormaz-Matamala, A. C. Kehrig, C. Kuiper, R. Leitherer, C. Mahy, L. McLeod, A. F. Mehner, A. Morrell, N. Shenar, T. Telford, O. G. van Loon, J. Th. Tramper, F. Wofford, A.
contents	Massive stars lead 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 by using state-of-the-art PoWR atmosphere models. We determine the stellar and wind parameters (e.g., $T_\star$, $\log g$, $L_{\star}$, $\dot{M}$, $v_\infty$) of the analyzed objects, chemical abundances (C, N, O), ionizing and mechanical feedback ($Q_\mathrm{H}$, $Q_\mathrm{He{\small{I}}}$, $Q_\mathrm{He{\small{II}}}$, $L_\mathrm{mec}$) and X-rays. We report ages of $2-4.5$ Myr and masses of $30-60$ $M_\odot$ for the analyzed stars in N11 B, 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 in most of the stars, up to a factor of seven. 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 $\log$ ($\sum$ $Q_\mathrm{H}$)$=50.5$ ph s$^{-1}$, $\log$ ($\sum$ $Q_\mathrm{He{\small{I}}}$)$=49.6$ ph s$^{-1}$ and $\log$ ($\sum$ $Q_\mathrm{He{\small{II}}}$)$=44.4$ ph s$^{-1}$, consistent with the total ionizing budget in N11.
format	Preprint
id	arxiv_https___arxiv_org_abs_2411_14149
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	X-Shooting ULLYSES: Massive Stars at Low Metallicity X. Physical Parameters and Feedback of Massive Stars in the LMC N11 B Star-Forming Region Gómez-González, V. M. A. Oskinova, L. M. Hamann, W. -R. Todt, H. Pauli, D. Serantes, S. Reyero Bernini-Peron, M. Sander, A. C. Ramachandran, V. Vink, J. S. Crowther, P. A. Berlanas, S. R. ud-Doula, A. Gormaz-Matamala, A. C. Kehrig, C. Kuiper, R. Leitherer, C. Mahy, L. McLeod, A. F. Mehner, A. Morrell, N. Shenar, T. Telford, O. G. van Loon, J. Th. Tramper, F. Wofford, A. Solar and Stellar Astrophysics Astrophysics of Galaxies Massive stars lead 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 by using state-of-the-art PoWR atmosphere models. We determine the stellar and wind parameters (e.g., $T_\star$, $\log g$, $L_{\star}$, $\dot{M}$, $v_\infty$) of the analyzed objects, chemical abundances (C, N, O), ionizing and mechanical feedback ($Q_\mathrm{H}$, $Q_\mathrm{He{\small{I}}}$, $Q_\mathrm{He{\small{II}}}$, $L_\mathrm{mec}$) and X-rays. We report ages of $2-4.5$ Myr and masses of $30-60$ $M_\odot$ for the analyzed stars in N11 B, 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 in most of the stars, up to a factor of seven. 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 $\log$ ($\sum$ $Q_\mathrm{H}$)$=50.5$ ph s$^{-1}$, $\log$ ($\sum$ $Q_\mathrm{He{\small{I}}}$)$=49.6$ ph s$^{-1}$ and $\log$ ($\sum$ $Q_\mathrm{He{\small{II}}}$)$=44.4$ ph s$^{-1}$, consistent with the total ionizing budget in N11.
title	X-Shooting ULLYSES: Massive Stars at Low Metallicity X. Physical Parameters and Feedback of Massive Stars in the LMC N11 B Star-Forming Region
topic	Solar and Stellar Astrophysics Astrophysics of Galaxies
url	https://arxiv.org/abs/2411.14149