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(Abridged) Globular clusters host multiple stellar populations showingdifferent sodium enrichments. These various populations can be observed alongthe main sequence, red giant and horizontal branch phases. Recently it wasshown, however, that at least in the globular cluster NGC 6752, no sodium-richstars are observed along the early asymptotic giant branch, posing an apparentproblem for stellar evolution. We present an explanation for this lack ofsodium-rich stars in this region of the colour-magnitude diagram.

Why the globular cluster NGC 6752 contains no sodium-rich second-generation AGB star