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We present computations of nucleosynthesis in red giants and asymptotic giantbranch stars of Population I experiencing extended mixing. The assumed physicalcause for mass transport is the buoyancy of magnetized structures, according torecent suggestions. The peculiar property of such a mechanism is to allow forboth fast and slow mixing phenomena, as required for reproducing the spread inLi abundances displayed by red giants and as discussed in an accompanyingpaper. We explore here the effects of this kind of mass transport on CNO andintermediatemass nuclei and compare the results with the available evidencefrom evolved red giants and from the isotopic composition of presolar grains ofAGB origin. It is found that a good general accord exists between predictionsand measurements; in this framework we also show which type of observationaldata best constrains the various parameters. We conclude that magneticbuoyancy, allowing for mixing at rather different speeds, can be an interestingscenario to explore for explaining together the abundances of CNO nuclei and ofLi.

Nucleosynthesis of light element isotopes in evolved stars experiencing extended mixing