Fig. 3.
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RV variability and position in the Teff − log g diagram. Left panel: Teff − log g diagram similar to Fig. 1 of the sample of He-poor sdO/Bs with different regions marked by colour (EHB1 red, EHB2 green, EHB3 yellow, postEHB blue, bEHB grey) and the size of the symbol encoding Δ RVmax. In addition to the canonical EHB for a mass of 0.47 M⊙ (Dorman et al. 1993) the EHB for a low mass of 0.35 M⊙ (Han et al. 2002) is plotted as long-dashed grey line. Right panel: close-up of the same diagram showing the division between the regions EHB2 and EHB3 in more detail.
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