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C-enhanced metal poor stars and AGB nucleosynthesis at low Z

The study of C-enhanced metal poor stars with s-process elements overabundances offers a chance of testing the AGB models at low metallicity and constrain the nucleosynthesis codes. We analyzed a total of 13 C-enhanced metal poor stars, of which 12 turned out to be s-process enriched. The combination of our results with the analyses already published in the literature allows to highlight the discrepancies present between the current state of the art AGB low metallicity models, suggesting that they are still lacking some ingredient.