Fig. 6
Evolutionary tracks from the Padova set (Bertelli et al. 2008, 2009) for Y = 0.26 and Z = 0.017, with masses between 1 and 8 M⊙, as indicated (in red) at the end of each track. The asymptotic giant branches are depicted with dashed (red) lines. The location of W Aql as derived from the interferometric radii measured by Danchi et al. (1994) and van Belle et al. (1997) are depicted by (red) triangles.
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