Fig. 5
HRD showing the analyzed WN9h stars (red filled symbols). For comparison we plotsingle Galactic WN stars from Hamann et al. (2006) (open symbols), WNL stars of the Arches cluster from Martins et al. (2008, labeled with F and B numbers), and WR102c and WR102ka from Barniske et al. (2008). Different symbols refer to different spectral subtypes, cf. inset. Hydrogen and helium zero-age main-sequence are given as solid lines.
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