DISCOVERY OF P-MODE INSTABILITIES IN THE HOT SUBDWARF-B STAR PG-1047+003

We report the discovery of multiperiodic luminosity variations in the hot B subdwarf PG 1047+003. At least five periodicities are seen in th e light curve, from 104.2 s to 161.9 s, but others are also present at lower amplitudes in that interval. The largest oscillation has an amp litude of similar or equal to 9.2 millimag in white light and a period of 142.2 s. With atmospheric parameters T-eff similar to 34,370 K and log g similar to 5.7 for PG 1047+003, these variations are identified with low-order radial and nonradial (p and f) pulsation modes. The si milarity of periods and derived stellar parameters indicate that PG 10 47+003 is a genuine member of the EC 14026 class, the latest and newes t family of pulsators in the field of asteroseismology. However, it sh ows no evidence of a binary companion, implying that the mechanism for driving pulsations is internal to the star. We also report on the cur rent status of our ongoing survey to search for additional sdB pulsato rs.