Li-rich stars with GALAH, Gaia and GALEX data

We aim to uncover possible origins of this population, by analyzing 1099 Li-rich giants (A(Li)>=1.5) in GALAH DR3. To expose peculiar traits of Li-rich stars, we construct a reference sample of Li-normal (doppelganger) stars with matched evolutionary state and fiducial iron-peak and alpha-process abundances ([Fe/H] and [Mg/Fe]).

Comparing Li-rich and doppelganger spectra reveals systematic differences in the H{alpha} and Ca-triplet line profiles associated with the velocity broadening measurement. We also find twice as many Li-rich stars appear to be fast rotators (2% with vbroad >~20km/s) compared to doppelgangers. On average, Li-rich stars have higher abundances than their doppelgangers, for a subset of elements, and Li-rich stars at the base of RGB have higher mean s-process abundances (>=0.05dex for Ba, Y, Zr), relative to their doppelgangers.