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Lithium synthesis in low metallicity AGB stars

Iwamoto, Nobuyuki  

We evolve thermally pulsing AGB star models in the mass of $$1-8M_odot$$. The metallicity is assumed to be [Fe/H] $$simeq -3$$. The 1 and $$2M_odot$$ AGB models produce Li in an H-flash event. The occurrence of this event is associated with the ingestion of protons from the overlying H-rich envelope into the He-flash driven convective shell during thermal pulse phase. The resulting Li abundances are higher than the primordial one. The present investigation also confirms the efficient production of Li by the HBB in the intermediate-mass AGB stars. If these AGB stars belong to a binary system with a low-mass companion, mass loss from the primary AGB star transfers the materials enriched in Li to the surface of the secondary star and makes the surface composition Li-rich. The nucleosynthesis of the other light elements is also followed until the end of the AGB phase. We find that the yields of the low metallicity AGB stars well reproduce the abundance patterns of extremely metal-poor stars.

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