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Three new pulsating sdB stars from the Edinburgh–Cape survey
Authors:D Kilkenny  R S Stobie  D O'Donoghue  C Koen  N Hambly  H MacGillivray  A E Lynas-Gray
Institution:South African Astronomical Observatory, PO Box 9, Observatory 7935, South Africa;Wide Field Astronomy Unit, Institute for Astronomy, University of Edinburgh, Blackford Hill, Edinburgh EH9 3HJ;Department of Physics, University of Oxford, 1 Keble Rd., Oxford OX1 3RH
Abstract:We report the discovery of very rapid pulsations in three sdB stars from the Edinburgh–Cape blue object survey. The short periods, small amplitudes and multi-periodicity clearly establish these stars as members of the EC 14026 class. EC 11583−2708 has pulsation periods near 149, 144 and 114 s, though evidence is presented that the 149-s period is resolved into two periods at 148.87 and 148.55 s by the full photoelectric data set. The amplitudes of the detected variations are in the range 0.002–0.006 mag. The light variation of EC 20338−1925 is dominated by a period near 147 s with a very large amplitude for a variable sdB star (0.025 mag), though four other frequencies are detected with periods near 168, 151, 141 and 135 s and amplitudes in the range 0.002–0.005 mag. The third star, EC 09582−1137, displays a light curve which is virtually a textbook example of frequency beating, being produced by two pulsations of almost equal amplitude (∼0.008 mag) and periods near 136.0 and 151.2 s.
Keywords:stars: individual: EC 11583−2708  stars: individual: EC 20338−1925  stars: individual: EC 09582−1137  stars: oscillations  stars: variables: other
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