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A Survey for Pulsating Hot B Subdwarfs in the Northern Hemisphere

We present the final results of a survey to search for pulsating hot B subdwarf (sdB) stars. We picked our candidates on the basis of their values of Teff and log g, as estimated from available quantitative optical spectroscopy. With the help of a three-channel photometer, we gathered "white-light" light curves using a uniform sampling time of 10 s for a total of 74 stars. Our survey had a yield of ~5.4%, leading to the discovery of detectable luminosity variations in four objects: PG 1047+003, KPD 2109+4401, KPD 1930+2752, and PG 0014+067. For the light curves of the other 70 stars, we derive upper limits on the amplitudes of possible periodic signals (in the period window 20-1000 s) that range from ~0.05% of the mean brightness of the star at an apparent magnitude of y ~ 12 to ~0.20% at y ~ 15. We use our survey results as well as those of others to discuss the location and extent of the empirical instability "strip" for pulsating sdB stars in the log g-Teff diagram. We also address the question of the coexistence of pulsators and nonvariable stars in the same region of that diagram.