Abstract Details

Name: . Deepak
Affiliation: Indian Institute of Astrophysics
Conference ID: ASI2020_107
Title : Evolution of lithium in the Milky Way
Authors and Co-Authors : Deepak; Bacham E. Reddy and David L. Lambert
Abstract Type : Poster
Abstract Category : Stars, ISM and Galaxy
Abstract : Here, we discuss the evolution of lithium (Li) in the Galaxy based on the data from the GALAH and Gaia surveys. The present amount of Li, A(Li) ~ 3.2 dex, found in the young stars and ISM is almost ten times higher than the amount of Li observed in old metal-poor stars, and about three times higher than the primordial Li abundance in the universe predicted by the Standard Big Bang Nucleosynthesis model based on the results from the Wilkinson Microwave Anisotropy Probe (WMAP). This suggests that Li has enriched in the Galaxy over time. In this talk, we plan to discuss the evolution of Li in the Galaxy based on different signatures of evolutionary trends of Li abundance with respect to the metallicity. We will also discuss the possible Li enrichment in the Galaxy through Li enrichment in low mass RGB stars. In our recent study based on a large data set of about 60 thousand low-mass giants, we found that most of the Li-rich giants are red-clump giants or He core-burning giants. They are more prevalent among metal-rich thin disk compared to thick disk and very metal-poor halo. We also plan to discuss the chemical compositions of the Li-rich giants, which is further used to understand the origins of Li enrichment in the Li-rich giants as well as the Galaxy.