The EC 14026 stars – VI. PG 1047+003 |
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| Authors: | O'Donoghue Koen Lynas-Gray Kilkenny & van Wyk |
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| Institution: | Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa,;South African Astronomical Observatory, PO Box 9, Observatory 7935, Cape, South Africa,;Department of Physics, University of Oxford, 1 Keble Road, Oxford OX1 3RH |
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| Abstract: | We report the discovery of rapid oscillations in the sdB star PG 1047+003. The oscillations are multiperiodic, with nine periods in the range 104–162 s. The optical spectrum of PG 1047+003 is consistent with that of a single sdB star. Line profile fitting yields an effective temperature of 35 000±1000 K and log g =5.9±0.1, although optical photometry and IUE spectrophotometry may indicate a cooler effective temperature. These properties demonstrate that PG 1047+003 is an EC 14026 star, a recently discovered class of sdB pulsators. Optical and infrared photometry constrains any cool companion to the sdB star to be a main-sequence star of spectral type M0 or later. With V =13.47 and a relatively rich pulsation spectrum, PG 1047+003 is an attractive target for an intensive photometric campaign to extract more periods from the light curve which, along with a suitable grid of pulsation models, will probe the interior structure of the star. |
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| Keywords: | stars: individual: PG 1047+003 stars: oscillations |
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