The IACOB project

There is increasing evidence that single-star evolutionary models are unable to reproduce all of the observational properties of massive stars. Binary interaction has emerged as a key factor in the evolution of a significant fraction of massive stars. In this study, we investigate the helium (Y He ) and nitrogen ( ϵ N ) surface abundances in a comprehensive sample of 180 Galactic O-type stars with projected rotational velocities of ≤150 km s −1 . We found a subsample (∼20% of the total, and ∼80% of the stars with Y He ≥ 0.12) with a Y He and ϵ N combined pattern that is unexplainable by single-star evolution. We argue that the stars with anomalous surface abundance patterns are binary interaction products.

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Publication Details

Journal
Astronomy and Astrophysics
Published
2024-12-20
DOI
https://doi.org/10.1051/0004-6361/202452622
Citations
7
Primary Topic
Stellar, planetary, and galactic studies
Type
article
Field-Weighted Citation Impact
2.32

Funders

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article

The IACOB project

S. Simón-Díaz, Z. Keszthelyi, N. Langer, J. Puls et al.
7 citations
Astronomy and Astrophysics
Stellar, planetary, and galactic studies
2.32
article

The IACOB project

S. Simón-Díaz, Z. Keszthelyi, N. Langer, J. Puls, G. Holgado, C. Martínez-Sebastián, Harim Jin
article en
7 citations

Abstract

There is increasing evidence that single-star evolutionary models are unable to reproduce all of the observational properties of massive stars. Binary interaction has emerged as a key factor in the evolution of a significant fraction of massive stars. In this study, we investigate the helium (Y He ) and nitrogen ( ϵ N ) surface abundances in a comprehensive sample of 180 Galactic O-type stars with projected rotational velocities of ≤150 km s −1 . We found a subsample (∼20% of the total, and ∼80% of the stars with Y He ≥ 0.12) with a Y He and ϵ N combined pattern that is unexplainable by single-star evolution. We argue that the stars with anomalous surface abundance patterns are binary interaction products.

Astronomy and AstrophysicsVol. 693
Universidad de La Laguna (ES), LMU Klinikum (DE), Instituto de Astrofísica de Canarias (ES), Max Planck Institute for Radio Astronomy (DE), National Astronomical Observatory of Japan (JP), Ludwig-Maximilians-Universität München (DE)
Ministerio de Ciencia, Innovación y Universidades, International Max Planck Research School for Environmental, Cellular and Molecular Microbiology, Ministerio de Economía y Competitividad, Ministerio de Ciencia e Innovación, National Astronomical Observatory of Japan, Rheinische Friedrich-Wilhelms-Universität Bonn, International Max Planck Research School for Advanced Methods in Process and Systems Engineering, Instituto de Astrofísica de Andalucía, Instituto de Astrofísica de Canarias, Japan Society for the Promotion of Science, European Regional Development Fund, Agencia Estatal de Investigación
Openalex Percentile: Top 12%
Stellar, planetary, and galactic studies
2.32
DOIOpen Access PDFOpenAlex
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The IACOB project — S. Simón-Díaz, Z. Keszthelyi, et al. · Astronomy and Astrophysics (2024) | TGRS Research Map | TGRS