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We present Li, Na, Al and Fe abundances of 199 lower red giant branch starsmembers of the stellar system Omega Centauri, using high-resolution spectraacquired with FLAMES at the Very Large Telescope. The A(Li) distribution ispeaked at A(Li) ~ 1 dex with a prominent tail toward lower values. The peak ofthe distribution well agrees with the lithium abundances measured in lower redgiant branch stars in globular clusters and Galactic field stars. Stars withA(Li) ~ 1 dex are found at metallicities lower than [Fe/H] ~ -1.3 dex but theydisappear at higher metallicities. On the other hand, Li-poor stars are foundat all the metallicities. The most metal-poor stars exhibit a clear Li-Naanticorrelation, with about 30% of the sample with A(Li) lower than ~ 0.8 dex,while in normal globular clusters these stars represent a small fraction. Mostof the stars with [Fe/H] > -1.6 dex are Li-poor and Na-rich. The Li depletionmeasured in these stars is not observed in globular clusters with similarmetallicities and we demonstrate that it is not caused by the proposed heliumenhancements and/or young ages. Hence, these stars formed from a gas alreadydepleted in lithium. Finally, we note that Omega Centauri includes all thepopulations (Li-normal/Na-normal, Li-normal/Na-rich and Li-poor/Na-rich stars)observed, to a lesser extent, in mono-metallic GCs.

Lithium abundance in lower red giant branch stars of Omega Centauri