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Fig. 6


Teff − log g diagram of RV variable helium-rich sdOB and sdO stars (see Fig. 1). The size of the symbols scales with ΔRVmax. The helium main sequence (HeMS) and the HB band are superimposed with HB evolutionary tracks (dashed lines) for subsolar metallicity (log z = −1.48) from Dorman et al. (1993). The three tracks correspond to helium core masses of 0.488, 0.490 and 0.495 M (from bottom-left to top-right).

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