Homogeneous investigation of lithium in globular clusters

Lithium allows us to test stellar evolutionary models, as well as different types of polluters for second population stars in the multiple population scenarios. In fact, this element is created during the Big Bang nucleosynthesis and it is destroyed in stellar interiors at relatively low temperatures. However, it should be preserved in the stellar envelopes of unevolved stars and progressively diluted during mixing processes. In particular, after the first dredge-up along the RGB, lithium should be completely destroyed, but this is not what we observe today in globular clusters. Due to the difficulty in the measurement of the small available lithium line, few GCs have been studied in detail so far. Literature results are not homogeneous for what concerns type of stars, sample sizes, and chemical analysis methods. Combining the exquisite quality of the last releases of Gaia and Gaia-ESO (EDR3 and iDR6, respectively), we present a homogeneous investigation of lithium in the largest sample of GCs member stars (about 1100 in 15 clusters, both dwarfs and giants).