Fig. 3.

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A(Li) as a function of the 12C/13C ratio in J-type stars (blue dots, Table 1) and at the surface of our AGB models immediately after the PIE (black triangles). Dashed black lines show the changes in abundances during the subsequent AGB evolution. The short (long) vertical arrow indicates the lithium abundance if the 3He mass fraction in the H-rich envelope of the M2.0_Zsun model is divided by 10 (100) before the PIE. The filled triangle corresponds to a 2 M⊙ AGB at solar metallicity computed with thermohaline mixing (cf. Sect. 3.6 for details).
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