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Fig. 11

image

Evolution of the residual H content (in solar units) in terms of the effective temperature for our 0.9 M progenitor with Z = 0.0001 during the thermally pulsing and post-AGB phases. Our standard sequence is depicted with a dot-dashed line. The sequence including overshooting during the TP-AGB phase is shown with a solid line. Two additional artificial sequences with no overshooting are included: one in which the carbon and oxygen enrichment expected from the third dredge-up is only considered in the envelope opacity computation (dotted line), and another one in which the abundances of carbon and oxygen have been altered according to the predictions of the third dredge-up (see text for details).

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