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Fig. 13

image

Abundance profiles in the standard 3.5 M  model at solar on the SGB at the location of wGb stars (left), at the completion of the 1st DUP (center), and in the clump at the location of wGb stars (right). The bold parts of the tracks correspond to the mean values derived for our sample of wGb stars. The bold black line represents the nuclear energy generation inside the star (the scale of which is not presented on the plot), and the lime-green bold part on this track represents the region where the surface C and N abundances of the wGb stars are encountered inside the model.

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