Fig. 4
Observationally derived position of BK Vir on the H-R diagram (green dot with the error bars). The open triangles and solid line represent the evolutionary tracks for a 1 and 2 M⊙ star from Bertelli et al. (2008) and Herwig (2005), respectively. The AGB stage (early AGB and thermally-pulsing AGB) is marked in blue and red for the evolutionary tracks for 1 M⊙ and 2 M⊙, respectively.
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