2001A&A...368..175O

We report the detection of short period oscillations in the sdB stars HS 0815+4243, HS 2149+0847 and HS 2201+2610 from time-series photometry made at the Nordic Optical Telescope (NOT) from a sample of 31 candidates. Hence these three hot subdwarfs are new members of the EC14026 class of pulsating sdB stars. One short period is detected for HS 0815+4243 (P∼126s; A∼7mma) and two short periods are seen for HS 2149+0847 (P∼142, 159s; A∼11, 7mma), whereas the single oscillation detected for HS 2201+2610 has a considerably longer period (P∼350s; A∼11ma). Our NLTE model atmosphere analysis of the time-averaged optical spectra indicate that HS 0815+4243 has T_eff=33700K and logg=5.95, HS 2149+0847 has T_eff=35600K and logg=5.9, and HS 2201+2610 has T_eff=29300K and logg=5.4. This places the former two at the hot end and the latter at the cool end of the theoretical sdBV instability strip.