Fig. 2
Hertzsrpung-Russell diagram presenting the surface gravities (log g) vs. the effective temperatures (Teff) for the stars investigated in this paper (shown with plus signs). We have also indicated, with triangles, the supergiants and α Boo, that have been investigated at high spectral resolution earlier in the literature (Jennings & Sada 1998; Ryde et al. 2002, 2006a,b).
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