Fig. E.9
The temperature of VFTS 151 (O6.5 II(f)p) is based on the lines He i λ4471, N iii λ4634/4640, N iv λ4058, and N v λ4604/4620. The He ii absorption lines are slightly narrower than the models which suggests a log g value below 4.0. The spectrum shows weak RV variations and LPVs. The star is multiple in the HST observations and the luminosity might be overestimated. N is enriched. He ii λ4686 is in emission whilst Hα is in absorption which suggests He enrichment at the surface.
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