Fig. 1
High resolution optical spectrum of the Galactic O3 V((f∗)) star HD 64568 (green), compared with the best-fitting synthetic H/He/N spectrum from our grid (black, convolved with vsini = 100 km s-1, see Markova et al. 2011). N ivλ6380 and N vλ4603 not observed. Grid parameters: Teff = 48 kK, log g = 4.0, log Q = −12.8 (series “D”), YHe = 0.1, [N] = 8.38. Fine tuning of the parameters can improve the fit.
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