Using Binary Population Synthesis to Examine the Impact of Binary Evolution on the C, N, O, and $S$-Process Yields of Solar-Metallicity Low- and Intermediate-Mass Stars
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| Format: | Preprint |
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2024
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| _version_ | 1866912140370116608 |
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| author | Osborn, Zara Karakas, Amanda I. Kemp, Alex J. Izzard, Robert Kamath, Devika Lugaro, Maria |
| author_facet | Osborn, Zara Karakas, Amanda I. Kemp, Alex J. Izzard, Robert Kamath, Devika Lugaro, Maria |
| contents | Asymptotic giant branch (AGB) stars play a significant role in our understanding of the origin of the elements. They contribute to the abundances of C, N, and approximately $50\%$ of the abundances of the elements heavier than iron. An aspect often neglected in studies of AGB stars is the impact of a stellar companion on AGB stellar evolution and nucleosynthesis. In this study, we update the stellar abundances of AGB stars in the binary population synthesis code \textsc{binary\_c} and calibrate our treatment of the third dredge-up using observations of Galactic carbon stars. We model stellar populations of low- to intermediate-mass stars at solar-metallicity and examine the stellar wind contributions to C, N, O, Sr, Ba, and Pb yields at binary fractions between 0 and 1. For a stellar population with a binary fraction of 0.7, we find $\sim 20-25\%$ less C and $s$-process elements ejected than from a population composed of only single stars, and we find little change in the N and O yields. We also compare our models with observed abundances from Ba stars and find our models can reproduce most Ba star abundances, but our population estimates a higher frequency of Ba stars with a surface [Ce/Y] > $+0.2\,$dex. Our models also predict the rare existence of Ba stars with masses $> 10 \text{M}\,_\odot$. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2412_01025 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Using Binary Population Synthesis to Examine the Impact of Binary Evolution on the C, N, O, and $S$-Process Yields of Solar-Metallicity Low- and Intermediate-Mass Stars Osborn, Zara Karakas, Amanda I. Kemp, Alex J. Izzard, Robert Kamath, Devika Lugaro, Maria Solar and Stellar Astrophysics Astrophysics of Galaxies Asymptotic giant branch (AGB) stars play a significant role in our understanding of the origin of the elements. They contribute to the abundances of C, N, and approximately $50\%$ of the abundances of the elements heavier than iron. An aspect often neglected in studies of AGB stars is the impact of a stellar companion on AGB stellar evolution and nucleosynthesis. In this study, we update the stellar abundances of AGB stars in the binary population synthesis code \textsc{binary\_c} and calibrate our treatment of the third dredge-up using observations of Galactic carbon stars. We model stellar populations of low- to intermediate-mass stars at solar-metallicity and examine the stellar wind contributions to C, N, O, Sr, Ba, and Pb yields at binary fractions between 0 and 1. For a stellar population with a binary fraction of 0.7, we find $\sim 20-25\%$ less C and $s$-process elements ejected than from a population composed of only single stars, and we find little change in the N and O yields. We also compare our models with observed abundances from Ba stars and find our models can reproduce most Ba star abundances, but our population estimates a higher frequency of Ba stars with a surface [Ce/Y] > $+0.2\,$dex. Our models also predict the rare existence of Ba stars with masses $> 10 \text{M}\,_\odot$. |
| title | Using Binary Population Synthesis to Examine the Impact of Binary Evolution on the C, N, O, and $S$-Process Yields of Solar-Metallicity Low- and Intermediate-Mass Stars |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2412.01025 |