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Fig. 5


Very-low metallicity Teff-scale, revisited. Symbols represent the effective temperatures of individual stars in IC 1613, WLM, and NGC 3109 from GH13, Tramper et al. (2014), and Herrero et al. (2012), and in the SMC from Mokiem et al. (2007a) and Massey et al. (2009). The host galaxy is color-coded as indicated in the legend, whereas the symbol size codes the luminosity class (smallest symbol = dwarfs, largest symbol = supergiants). The solid lines are the Teff scales derived by GH13 for IC 1613 (blue) and the SMC (purple), and the dashed purple ones represent calibrations for SMC B supergiants (thick dashed) and dwarfs (thin dashed). The position of NGC 3109-4 in the abscissa axis has been slightly shifted to avoid overlap with NGC 3109-1.

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