Identify ~20,000 Li-rich Giants in the LAMOST Low-Resolution Survey
Ming-Yi Ding, Liang Wang, Jian-Rong Shi, Hong-Liang Yan, Chun-Qian Li, Jing Chen, Kai Zhang, Yu-Lu Liang, Zi-Chong Zhang, Xu-Hang Yin, Qin-Yang Dong

TL;DR
This study systematically identifies over 20,000 lithium-rich giant stars from the LAMOST low-resolution survey, creating a large, homogeneous catalog to advance understanding of stellar evolution and lithium enrichment.
Contribution
It introduces a robust method for detecting Li-rich giants using low-resolution spectra and provides the largest homogeneous catalog of such stars to date.
Findings
Over 20,000 Li-rich giants identified, about 2.5% of all giants in the sample.
Validated lithium abundances show good agreement with high-resolution studies.
The catalog enables detailed analysis of Li-rich giant occurrence across evolutionary stages.
Abstract
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 () 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 {\AA} 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 dex to select Li-rich candidates, followed by visual inspection to ensure the reliability of each detection. Eventually, more than 20,000 Li-rich…
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Taxonomy
TopicsStellar, planetary, and galactic studies · Astronomy and Astrophysical Research · Galaxies: Formation, Evolution, Phenomena
