Fig. 12.
Helium abundance versus Teff for the EHB stars in ω Cen (red circles) and for hot subdwarf stars among the galactic field population from the samples of Edelmann et al. (2003), Lisker et al. (2005), Stroeer et al. (2007), and Németh et al. (2012). The three H-sdOs with uncertain parameters are indicated with dashed errorbars (see Sect. 4.2). The two helium − Teff sequences identified by Edelmann et al. (2003) are shown in dashed lines.
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