Internal chemical abundances for the most abundant species of our 0TP and 3TP models for a 1 M⊙ progenitor at the ZZ Ceti stage (Mwd = 0.5508M⊙). During the evolution through the first three TPs the core–He transition shifts from − log (q)~ 1 to ~1.3 and the intershell region is built up.
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