Fig. 9
Teff – log g diagram of the full sample of binary sdB stars (light grey: WD companions, grey: M-dwarf companion, dark grey: unknown companion type). The size of the symbols corresponds to the minimum companion mass. The helium main sequence (HeMS) and the zero-age EHB (ZAEHB) are superimposed with EHB evolutionary tracks by Han et al. (2002) (dashed lines: menv = 0.000 M⊙, dotted lines: menv = 0.001 M⊙, dashed-dotted lines: menv = 0.005 M⊙ using 0.45 M⊙ models).
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