Pulsating (filled circles) and nonpulsating (empty circles) PG 1159 stars in the log Teff − log g diagram. Evolutionary tracks are labeled with the respective stellar masses in M⊙ (Miller Bertolami & Althaus 2006). The red edge (short dashed line) of the instability region (Quirion et al. 2006) and two blue edges (long dashed lines, Quirion et al. 2007) are shown. The upper and lower blue edges are for z = 0 and 0.007, respectively.
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