Lithium is made up in the envelopes of massive Asymptotic Giant Branch ( AGB ) stars through the process of Hot Bottom Burning .
In Globular Clusters , this processing is one possible source of the hot-CNO burning whose nuclear products are then ejected into the intracluster medium and take part in the formation of a second stellar generation , explaining the peculiar distribution of chemical elements among the cluster stars .
We discuss the lithium yields from AGB stars in the mass range 3– \sim 6.3 { M } _ { \odot } , and from super–AGB stars of masses in the range 6.5 –9 { M } _ { \odot } for metallicity Z=10 ^ { -3 } .
The qualitative behaviour of these yields is discussed in terms of the physical structure of the different masses .
Although many uncertainties affect the other yields of these stars ( e.g .
O , Na and Mg ) , even larger uncertainties affect the lithium yield , as it depends dramatically on the adopted description of mass loss .
When we adopt our standard mass loss formulation , very large yields are obtained especially for the super-AGB stars , and we discuss their possible role on the lithium abundance of second generation stars in globular clusters .