Three new pulsating sdB stars from the Edinburgh–Cape survey

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, thoug...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2006-04, Vol.367 (4), p.1603-1608
Hauptverfasser: Kilkenny, D., Stobie, R. S., O'Donoghue, D., Koen, C., Hambly, N., MacGillivray, H., Lynas-Gray, A. E.
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container_end_page 1608
container_issue 4
container_start_page 1603
container_title Monthly notices of the Royal Astronomical Society
container_volume 367
creator Kilkenny, D.
Stobie, R. S.
O'Donoghue, D.
Koen, C.
Hambly, N.
MacGillivray, H.
Lynas-Gray, A. E.
description 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.
doi_str_mv 10.1111/j.1365-2966.2006.10065.x
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source Wiley Journals; Oxford Journals Open Access Collection
subjects Astronomy
Earth, ocean, space
Exact sciences and technology
Frequencies
Pulsars
Stars & galaxies
stars: individual: EC 09582−1137
stars: individual: EC 11583−2708
stars: individual: EC 20338−1925
stars: oscillations
stars: variables: other
title Three new pulsating sdB stars from the Edinburgh–Cape survey
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