Lithium in a metal-poor external galaxy: ω Centauri

omega Centani is it massive stellar system which is currently going through the Galactic Halo Its compact, aspect and spheroidal shape have rot a long time led to it being classified as a Globular Cluster However the fact that its stars cover a wide metallicity range (-0 6 <[Fe/H]< -2.1) points to this object, as an external galaxy. satellite of the Milky Way Lithium among warm metal-poor stilts shows a toughly constant, abundance, the "Spite Plateau" This has been interpreted as evidence lot a primordial origin of the lithium nucleus, at, the time of nucleosynthesis After the physical conditions uncle which nucleosynthesis occurred, have been constrained by the observations of the fluctuations Ions of the Cosmic Microwave Background: we ale facing a "cosmological lithium problem", namely the primordial lithium was a factor of three to four higher than what, observed in the Spite plateau Several avenues may be taken to solve tins conundrum: either relying, on fundamental physics or on stellar physics, however the realin of possibilities may be considerably narrowed by observing stellar populations in different, galaxies, which lime experienced different evolutionary histories Some of the proposed "solutions" may be clearly ruled out, depending on the observation of lithium in the metal-poor populations of external galaxies omega Centauri is the only external galaxy amenable to such an investigation in the era of 8m telescopes We have pushed to its limits FLAMES at, the ESO 8 2m telescope to obtain high resolution spectra of the Li I doublet, in 91 Turn-Off and Sub-Giant stars at V similar to 18 in omega Centauri We present out priliminary results on this data which suggest that the Li content in omega Centauri warm stars is comparable to that observed in Galactic Halo field stars of similar metallicities and temperatures This may effectively title out, a whole class of models which invoke a severe Li depletion through processing of material in an early generation of massive stars