Identify ~20,000 Li-rich Giants in the LAMOST Low-Resolution Survey
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2026
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| _version_ | 1866915818036527104 |
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| author | Ding, Ming-Yi Wang, Liang Shi, Jian-Rong Yan, Hong-Liang Li, Chun-Qian Chen, Jing Zhang, Kai Liang, Yu-Lu Zhang, Zi-Chong Yin, Xu-Hang Dong, Qin-Yang |
| author_facet | Ding, Ming-Yi Wang, Liang Shi, Jian-Rong Yan, Hong-Liang Li, Chun-Qian Chen, Jing Zhang, Kai Liang, Yu-Lu Zhang, Zi-Chong Yin, Xu-Hang Dong, Qin-Yang |
| contents | Li-rich giants serve as valuable tracers of stellar evolution and surface enrichment processes, for which a statistically large and homogeneous sample is crucial. Using the massive low-resolution ($R \sim 1800$) spectroscopic dataset from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey, we systematically search for Li-rich giants by determining their stellar lithium abundances through template matching of the Li I 6708 Å absorption line with a grid of synthetic spectra generated from ATLAS9 model atmospheres. The derived abundances are validated against previous high-resolution studies, showing good consistency with a mean absolute error of about 0.15 dex. Therefore, we adopt a threshold of $A(\rm{Li}) > 1.65$ dex to select Li-rich candidates, followed by visual inspection to ensure the reliability of each detection. Eventually, more than 20,000 Li-rich giants are identified, corresponding to approximately 2.5% of all giants in LAMOST DR9. We also investigate the occurrence rate of Li-rich giants in different evolutionary stages. This work presents a large and homogeneous catalog of Li-rich giants derived from the LAMOST low-resolution survey, which provides a reliable and valuable dataset for future studies of stellar evolution and lithium enrichment in evolved stars. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2602_22572 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Identify ~20,000 Li-rich Giants in the LAMOST Low-Resolution Survey Ding, Ming-Yi Wang, Liang Shi, Jian-Rong Yan, Hong-Liang Li, Chun-Qian Chen, Jing Zhang, Kai Liang, Yu-Lu Zhang, Zi-Chong Yin, Xu-Hang Dong, Qin-Yang Solar and Stellar Astrophysics Astrophysics of Galaxies Li-rich giants serve as valuable tracers of stellar evolution and surface enrichment processes, for which a statistically large and homogeneous sample is crucial. Using the massive low-resolution ($R \sim 1800$) spectroscopic dataset from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey, we systematically search for Li-rich giants by determining their stellar lithium abundances through template matching of the Li I 6708 Å absorption line with a grid of synthetic spectra generated from ATLAS9 model atmospheres. The derived abundances are validated against previous high-resolution studies, showing good consistency with a mean absolute error of about 0.15 dex. Therefore, we adopt a threshold of $A(\rm{Li}) > 1.65$ dex to select Li-rich candidates, followed by visual inspection to ensure the reliability of each detection. Eventually, more than 20,000 Li-rich giants are identified, corresponding to approximately 2.5% of all giants in LAMOST DR9. We also investigate the occurrence rate of Li-rich giants in different evolutionary stages. This work presents a large and homogeneous catalog of Li-rich giants derived from the LAMOST low-resolution survey, which provides a reliable and valuable dataset for future studies of stellar evolution and lithium enrichment in evolved stars. |
| title | Identify ~20,000 Li-rich Giants in the LAMOST Low-Resolution Survey |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2602.22572 |