Observed EHB star instability strip in ω Cen, based on the 26 targets listed in Table 5 for which the achieved detection threshold for pulsations is less than 1%. The five rapid pulsators are marked by large open circles. Red symbols indicate H-rich EHB stars, blue ones show He-rich targets (compared to Solar). The error bars refer to the formal uncertainties on the atmospheric parameters and have been extended somewhat arbitrarily towards higher surface gravities for the spectra classified as polluted since the derived values of log g only constitute a lower limit for these stars. Dotted error bars indicate targets where the detection threshold of the photometry lies above 0.5% (but below 1.0%) and low-amplitude pulsations cannot be excluded.
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