Fig. 13.
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Variation with the effective temperature of the optical depth characterizing various evolutionary phases of a 1 M⊙ model star, from the tip of the AGB (first point on the plane) to the post-AGB phase. Full squares connected with solid lines indicate the values of obtained with the physical ingredients discussed in Sect. 2 to model the evolution of the star, whereas open squares refer to the expected optical depths that would be observed in the present epoch, . The dashed orange line indicates the optical depth of J050221.17, obtained by SED fitting.
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