Lithium-rich Giants in LAMOST Survey. I. The Catalog

TL;DR

This paper presents a catalog of lithium-rich giant stars identified from the LAMOST survey, utilizing a new template-matching method to derive Li abundances from low-resolution spectra, expanding the known sample of such stars.

Contribution

It introduces a novel template-matching technique for Li abundance measurement and provides a large catalog of Li-rich giants from LAMOST data.

Findings

Large sample of Li-rich giants identified

New method improves Li abundance determination from low-res spectra

Expands the known population of Li-rich giant stars

Abstract

Standard stellar evolution model predicts a severe depletion of lithium (Li) abundance during the first dredge up process (FDU). Yet a small fraction of giant stars are still found to preserve a considerable amount of Li in their atmospheres after the FDU. Those giants are usually identified as Li-rich by a widely used criterion, A(Li) > 1.5 dex. A large number of works dedicated to searching for investigating this minority of the giant family, and the amount of Li-rich giants, has been largely expanded on, especially in the era of big data. In this paper, we present a catalog of Li-rich giants found from the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey with Li abundances derived from a template-matching method developed for LAMOST low-resolution spectra.