Abstract / Description of output
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.
Original language | English |
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Pages (from-to) | 1603-1608 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 367 |
Issue number | 4 |
DOIs | |
Publication status | Published - 1 Apr 2006 |
Keywords / Materials (for Non-textual outputs)
- stars: individual: EC 11583-2708
- stars: individual: EC 20338-1925
- stars: individual: EC 09582-1137
- stars: oscillations
- stars: variables: other