Fig. 1
HR diagram: surface gravity vs effective temperatures of the stars in our sample including the stars in Tables 1–3. We overplot solar metallicity tracks from Girardi et al. (2000) for 0.7 to 1.8 M⊙. The luminosity classes of the stars in the sample are assigned according to each stars position in this diagram (see Sect. 3). Metallicity is represent by the size of the symbol.
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