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| Format: | Preprint |
| Veröffentlicht: |
2025
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| Online-Zugang: | https://arxiv.org/abs/2505.06494 |
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| _version_ | 1866915280249159680 |
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| author | Ashraf, Muhammad Zeshan Cui, Wenyuan Li, Hongjie |
| author_facet | Ashraf, Muhammad Zeshan Cui, Wenyuan Li, Hongjie |
| contents | Object LAMOST J020623.21+494127.9 (program star) in the thin disk of the Milky Way (MW) is reported as a highly r-process-enhanced (RPE) r-II star with[Eu/Fe]= +1.32 and [Fe/H]= -0.54. The chemical profile of the star reflects the intrinsic composition of the gas cloud present at its birth. Using an abundance decomposition method, we fit 25 elements from the abundance dataset, including 10 heavy neutron capture elements. We explore the astrophysical origin of the elements in this star through its abundance ratios and component ratios. We find that the contributions from the massive stars played a significant role in the production of light elements in the program star. Our analysis reveals that the heavy neutron-capture elements are produced purely by the main r-process. However, the adopted main r-process model does not adequately fit the observed data, suggesting another main r-process pattern may exist. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2505_06494 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Abundance Origin Of A Highly r-process-Enhanced r-II Star: LAMOST J020623.21+494127.9 Ashraf, Muhammad Zeshan Cui, Wenyuan Li, Hongjie Solar and Stellar Astrophysics Astrophysics of Galaxies Object LAMOST J020623.21+494127.9 (program star) in the thin disk of the Milky Way (MW) is reported as a highly r-process-enhanced (RPE) r-II star with[Eu/Fe]= +1.32 and [Fe/H]= -0.54. The chemical profile of the star reflects the intrinsic composition of the gas cloud present at its birth. Using an abundance decomposition method, we fit 25 elements from the abundance dataset, including 10 heavy neutron capture elements. We explore the astrophysical origin of the elements in this star through its abundance ratios and component ratios. We find that the contributions from the massive stars played a significant role in the production of light elements in the program star. Our analysis reveals that the heavy neutron-capture elements are produced purely by the main r-process. However, the adopted main r-process model does not adequately fit the observed data, suggesting another main r-process pattern may exist. |
| title | The Abundance Origin Of A Highly r-process-Enhanced r-II Star: LAMOST J020623.21+494127.9 |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2505.06494 |