The IACOB project XIII. Helium enrichment in O-type stars as a tracer of past binary interaction
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arXiv
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| Format: | Preprint |
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2024
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| author | Martínez-Sebastián, C. Simón-Díaz, S. Jin, H. Keszthelyi, Z. Holgado, G. Langer, N. Puls, J. |
| author_facet | Martínez-Sebastián, C. Simón-Díaz, S. Jin, H. Keszthelyi, Z. Holgado, G. Langer, N. Puls, J. |
| contents | There is increasing evidence that single-star evolutionary models are inadequate to reproduce all 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 ($Y_{\mathrm He}$) and nitrogen ($ε_{\mathrm N}$) surface abundances in a comprehensive sample of 180 Galactic O-type stars with projected rotational velocities $v\sin(i)\leq150{\mathrm km}\cdot{\mathrm s}^{-1}$. We found a subsample ($\sim20\%$ of the total, and $\sim80\%$ of the stars with $Y_{\mathrm He}\geq0.12$) with a $Y_{\mathrm He}$ and $ε_{\mathrm N}$ combined pattern unexplainable by single-star evolution. We argue that the stars with anomalous surface abundance patterns are binary interaction products. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_14107 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | The IACOB project XIII. Helium enrichment in O-type stars as a tracer of past binary interaction Martínez-Sebastián, C. Simón-Díaz, S. Jin, H. Keszthelyi, Z. Holgado, G. Langer, N. Puls, J. Solar and Stellar Astrophysics Astrophysics of Galaxies There is increasing evidence that single-star evolutionary models are inadequate to reproduce all 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 ($Y_{\mathrm He}$) and nitrogen ($ε_{\mathrm N}$) surface abundances in a comprehensive sample of 180 Galactic O-type stars with projected rotational velocities $v\sin(i)\leq150{\mathrm km}\cdot{\mathrm s}^{-1}$. We found a subsample ($\sim20\%$ of the total, and $\sim80\%$ of the stars with $Y_{\mathrm He}\geq0.12$) with a $Y_{\mathrm He}$ and $ε_{\mathrm N}$ combined pattern unexplainable by single-star evolution. We argue that the stars with anomalous surface abundance patterns are binary interaction products. |
| title | The IACOB project XIII. Helium enrichment in O-type stars as a tracer of past binary interaction |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.14107 |