Title: The GIRAFFE Inner Bulge Survey (GIBS). Lithium-rich giants towards the Milky Way Bulge

Abstract: I report on the chemical analysis of the UVES sample of the GIBS survey, comprising 90+ 
clump red giants in the inner disk / outer bulge, for which detailed abundances for up to 25 elements 
from Lithium to Yttrium, comprising all the main nucleosynthetic channels. The sample is mostly 
constituted by metal rich to moderately metal poor (-1.5<~[Fe/H]<~0.3). Among other results, we 
confirm the trend for inner-disk giants to display a markedly under-solar [Zn/Fe] ratio, already 
observed by us in the Gaia ESO UVES sample, and tentatively interpreted as due to increased Fe 
enrichment by Type 1a SN.
The most striking result is the presence in the sample of 10 Li-rich giants, with Li abundances in 
some cases close to the meteoritic value. Lithium abundance in giant atmospheres is supposed to 
decrease dramatically once the star evolves up the red giant branch, due to the increasingly deep 
atmospheric convection that burns Lithium in the inner layers of the envelope. About 2% to 5% of 
giants, however, display various degree of Li enrichment, whose origin is still hotly debated. The 
number of Li-rich stars in our sample is surprisingly high, about 10%, which probably points to a 
selection effect in the sample. Li abundances were derived with state of the art NLTE computations, 
and calculations were performed by means of 3D-NLTE modeling as well, with the purpose of 
investigating the 6Li/7Li isotopic ratio, a crucial diagnostic of the possible Li enrichment process.