Lithium Abundances from the LAMOST Med-Resolution Survey Data Release 9
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866917603574808576 |
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| author | Ding, Ming-Yi Shi, Jian-Rong Yan, Hong-liang Li, Chun-Qian Gao, Qi Chen, Tian-Yi Zhang, Jing-Hua Liu, Shuai Xie, Xiao-Jin Tang, Yao-Jia Zhou, Ze-Ming Wang, Jiang-Tao |
| author_facet | Ding, Ming-Yi Shi, Jian-Rong Yan, Hong-liang Li, Chun-Qian Gao, Qi Chen, Tian-Yi Zhang, Jing-Hua Liu, Shuai Xie, Xiao-Jin Tang, Yao-Jia Zhou, Ze-Ming Wang, Jiang-Tao |
| contents | Lithium is a fragile but crucial chemical element in the universe, exhibits interesting and complex behaviors. Thanks to the massive spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution survey (MRS), we can investigate the lithium abundances in a large and diverse sample of stars, which could bring vital help to study the origin and evolution of lithium. In this work, we use the Li 6,707.8 Å line to derive the lithium abundance through a template-matching method. A catalog of precise lithium abundance is presented for 795,384 spectra corresponding to 455,752 stars from the LAMOST MRS Data Release (DR) 9. Comparing our results with those of external high-resolution references we find a good consistency with a typical deviation of σ A(Li) ~ 0.2 dex. We also analyze the internal errors using stars that have multiple LAMOST MRS observations, which will reach as low as 0.1 dex when the signal-to-noise ratio (S/N) of the spectra > 20. Besides, our result indicates that a small fraction of giant stars still exhibit surprisingly high amount of lithium contents, and 967 stars are identified as Li-rich giants with A(Li) > 1.5 dex, accounting for ~ 2.6% of our samples. If one takes into account the fact that nearly all stars deplete lithium during the main sequence, then the fraction of Li-rich stars may exceed 2.6% much. This new catalog covers a wide range of stellar evolutionary stages from pre-main sequence to giants, and will provide help to the further study of the chemical evolution of lithium. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_01815 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Lithium Abundances from the LAMOST Med-Resolution Survey Data Release 9 Ding, Ming-Yi Shi, Jian-Rong Yan, Hong-liang Li, Chun-Qian Gao, Qi Chen, Tian-Yi Zhang, Jing-Hua Liu, Shuai Xie, Xiao-Jin Tang, Yao-Jia Zhou, Ze-Ming Wang, Jiang-Tao Solar and Stellar Astrophysics Astrophysics of Galaxies Lithium is a fragile but crucial chemical element in the universe, exhibits interesting and complex behaviors. Thanks to the massive spectroscopic data from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution survey (MRS), we can investigate the lithium abundances in a large and diverse sample of stars, which could bring vital help to study the origin and evolution of lithium. In this work, we use the Li 6,707.8 Å line to derive the lithium abundance through a template-matching method. A catalog of precise lithium abundance is presented for 795,384 spectra corresponding to 455,752 stars from the LAMOST MRS Data Release (DR) 9. Comparing our results with those of external high-resolution references we find a good consistency with a typical deviation of σ A(Li) ~ 0.2 dex. We also analyze the internal errors using stars that have multiple LAMOST MRS observations, which will reach as low as 0.1 dex when the signal-to-noise ratio (S/N) of the spectra > 20. Besides, our result indicates that a small fraction of giant stars still exhibit surprisingly high amount of lithium contents, and 967 stars are identified as Li-rich giants with A(Li) > 1.5 dex, accounting for ~ 2.6% of our samples. If one takes into account the fact that nearly all stars deplete lithium during the main sequence, then the fraction of Li-rich stars may exceed 2.6% much. This new catalog covers a wide range of stellar evolutionary stages from pre-main sequence to giants, and will provide help to the further study of the chemical evolution of lithium. |
| title | Lithium Abundances from the LAMOST Med-Resolution Survey Data Release 9 |
| topic | Solar and Stellar Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2403.01815 |