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Fig. 1

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Theoretical H–R diagram showing subdwarfs (violet filled circles) and main sequence stars brighter than 12.5 mag (small black circles) observed by TESS. Luminosities were derived from Gala parallaxes. The vertical arraignment of some points is due to adopted values of Teff = 50 000 K for sdO and Teff = 30 000 K for sdB stars for which values are not available and the use of Teff from spectral types for some main sequence stars. The solid line is the zero age main sequence for models with solar abundance (Bertelli et al. 2008). Also shown are the theoretical instability strips for β Cep and SPB stars from Miglio et al. (2007).

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