Fig. 7.

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Ratio of the average abundances of different chemical species in the ejecta of AGB stars with an initial mass 1.5 M⊙ (top panel), 4 M⊙ (middle panel), and 6 M⊙ (bottom panel) and the initial mass fractions. The different lines refer to the Z = 3 × 10−5 (black) and Z = 3 × 10−7 (green) model stars we investigated and to the Z = 3 × 10−4 (red) models published in D19. Dotted (dashed) lines in the panels refer to the results of Z = 3 × 10−5 models obtained by assuming an overshoot parameter a factor 2 lower (higher) than in the standard case. Long-dashed and dot-dashed lines in the middle panel indicate the results of the evolution of a 4 M⊙ model star with Z = 3 × 10−5, obtained by modelling mass loss according to Blöcker (1995) by assuming a value of the free parameter of ηR = 0.005 and ηR = 0.02, respectively.
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