<i>Gaia</i>-ESO survey: Lithium abundances in open cluster Red Clump stars

It has recently been suggested that all giant stars with mass below 2 $M_{\odot}$ suffer an episode of surface lithium enrichment between the tip red branch (RGB) and clump (RC). We test if above result can be confirmed in a sample RC RGB are members open clusters. discuss Li abundances six clusters ages 1.5 4.9 Gyr (turn-off masses 1.1 1.7 $M_{\odot}$). These observations compared predictions different models include rotation-induced mixing, thermohaline instability, mixing induced by first He flash, energy losses neutrino magnetic moment. In clusters, we find about 35\% similar or higher than those upper stars. This sign fresh production. Because extra-mixing connected to luminosity bump, expectation was for have systematically lower abundances. However, cannot confirm possible production is ubiquitous. For 65\% giants only determine abundance limits could hiding very low Our results indicate during RC, at levels would not classify as rich. Determination their carbon isotopic ratio help suffered extra followed enrichment. The qualitatively explained additional close flash.