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We present nucleosynthesis predictions for massive (5-7 solar masses)asymptotic giant branch (AGB) stars of solar metallicity where we delay theonset of the superwind to pulsation periods of P =700-800 days. We found thatdelaying the superwind in solar metallicity massive AGB stars results in alarger production of s-process elements, something that would be also expectedat lower metallicities. These new models and the available observations showthat massive C-O core AGB stars in our Galaxy and in the Magellanic Cloudsexperience considerable third dredge-up (TDU). Thus, if massive AGB stars atthe metallicities of the Globular Clusters (GCs) also experience deep TDU, thenthese stars would not be good candidates to explain the abundance anomaliesobserved in most GCs. However, more massive AGB stars (e.g., near the limit ofC-O core production) or super-AGB stars with O-Ne cores may not experience veryefficient TDU, producing the high He abundances needed to explain the multiplepopulations observed in some GCs.

Nucleosynthesis in massive AGB stars with delayed superwinds: implications for the abundance anomalies in Globular Clusters