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Astronomy and Astrophysics
Article . 2015
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Hal-Diderot
Article . 2015
Data sources: Hal-Diderot
https://doi.org/10.48550/arxiv...
Article . 2014
License: arXiv Non-Exclusive Distribution
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The MiMeS survey of magnetism in massive stars: CNO surface abundances of Galactic O stars

Authors: Martins, F.; Herve, A.; Bouret, J. -C.; Marcolino, W.; Wade, G. A.; Neiner, C.; Alecian, E.; +3 Authors

The MiMeS survey of magnetism in massive stars: CNO surface abundances of Galactic O stars

Abstract

The evolution of massive stars is still partly unconstrained. Mass, metallicity, mass loss and rotation are the main drivers of stellar evolution. Binarity and magnetic field may also significantly affect the fate of massive stars. Our goal is to investigate the evolution of single O stars in the Galaxy. For that, we use a sample of 74 objects comprising all luminosity classes and spectral types from O4 to O9.7. We rely on optical spectroscopy obtained in the context of the MiMeS survey of massive stars. We perform spectral modelling with the code CMFGEN. We determine the surface properties of the sample stars, with special emphasis on abundances of carbon, nitrogen and oxygen. Most of our sample stars have initial masses in the range 20 to 50 Msun. We show that nitrogen is more enriched and carbon/oxygen more depleted in supergiants than in dwarfs, with giants showing intermediate degrees of mixing. CNO abundances are observed in the range of values predicted by nucleosynthesis through the CNO cycle. More massive stars, within a given luminosity class, appear to be more chemically enriched than lower mass stars. We compare our results with predictions of three types of evolutionary models and show that, for two sets of models, 80% of our sample can be explained by stellar evolution including rotation. The effect of magnetism on surface abundances is unconstrained. Our study indicates that, in the 20-50 Msun mass range, the surface chemical abundances of most single O stars in the Galaxy are fairly well accounted for by stellar evolution of rotating stars.

Comment: 15 pages, 12 figures. Accepted in Astronomy & Astrophysics

Country
France
Subjects by Vocabulary

Microsoft Academic Graph classification: Physics CNO cycle Metallicity Astrophysics Stellar classification Galaxy Stars Supergiant Stellar evolution O-type star

Keywords

FOS: Physical sciences, Astronomy and Astrophysics, Astrophysics - Solar and Stellar Astrophysics, Space and Planetary Science, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph], Solar and Stellar Astrophysics (astro-ph.SR)

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  • citations
    This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    89
    popularity
    This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
    Top 10%
    influence
    This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
    Top 10%
    impulse
    This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
    Top 1%
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citations
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
89
Top 10%
Top 10%
Top 1%
Funded by
ANR| TUMSE
Project
TUMSE
Towards a global Understanding of Massive Stars Evolution
  • Funder: French National Research Agency (ANR) (ANR)
  • Project Code: ANR-11-JS56-0007
,
NSERC
Project
  • Funder: Natural Sciences and Engineering Research Council of Canada (NSERC)
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