Hertzsprung–Russell diagram with lines indicating the positions of homogeneous stellar models with hydrogen mass fractions X of 0, 0.1, 0.3, 0.5, and 0.75. The metallicity Z is as described in Sect. 3, while the helium mass fraction Y is given by Y= 1 − X − Z. The models with X = 0 are helium burning, the others are hydrogen burning. The numbers near the scatter points indicate the surface hydrogen mass fractions Xs of the observed SMC WR stars. Both the lines and the scatter points are color coded for Xs . Circles indicate apparently single stars; diamonds indicate binaries.
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