Definitions of the solar metallicity O star spectral types in the luminosity-temperature diagram derived from MSH05 (panel MW), the LMC metallicity (panel LMC) and the SMC metallicity (panel SMC) derived in this work. Panel MW shows the original MSH05 data as crosses and the interpolated 3.5 and 4.5 subclasses as filled circles. Plotted as filled boxes are the extrapolated subtypes 2.5 and 2. The open circles connected by solid lines representes the interpolated grid that defines the L and Teff values for each spectral subtype. The luminosity classes are indicated as Roman numerals (I – supergiants, III – giants and V – dwarfs), while the spectral subtypes are shown by Arabic numerals. The upper limit (dotted line) is given by the hot edge for luminous blue variables (LBV) given in Smith et al. (2004). All interpolations are derived by calculating mean values in linear space. Panel LMC shows the LMC metallicity grid derived from Mokiem et al. (2007) and panel SMC the one for SMC metallicity obtained from Heap et al. (2006).
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