Discovery of Nine Super Li-rich Unevolved Stars from the LAMOST Survey

Autor:	Yan, T. -S., Shi, J. -R., Wang, L., Yan, H. -L., Zhou, Z. -M., Zhou, Y. -T., Fang, X. -S., Li, C. -Q., Chen, T. -Y., Xie, X. -J.
Rok vydání:	2022
Předmět:	Astrophysics - Solar and Stellar Astrophysics Astrophysics - Astrophysics of Galaxies
Druh dokumentu:	Working Paper
DOI:	10.3847/2041-8213/ac63a5
Popis:	Based on the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) medium-resolution spectroscopic survey (MRS), we report the discovery of nine super Li-rich unevolved stars with A(Li) $>$ 3.8 dex. These objects show unusually high levels of lithium abundances up to three times higher than the meteoritic value of 3.3 dex, which indicates that they must have experienced a history of lithium enrichment. It is found that seven of our program stars are fast rotators with $vsini>9$ km\,s$^{-1}$, which suggests that the accretion of circumstellar matter may be the main contributor to the lithium enhancement of these unevolved stars, however, other sources cannot be excluded. Comment: 10 pages, 3 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2204.03180 Zobrazit plný text záznamu View this record from Arxiv