Published in
Oxford University Press (OUP), Monthly Notices of the Royal Astronomical Society, 3(371), p. 1497-1502
DOI: 10.1111/j.1365-2966.2006.10788.x
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- Oxford University Press (OUP) | PDF
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- [www.researchgate.net] | PDF
- [arxiv.org] | PDF
- [arxiv.org] | PDF
- [citeseerx.ist.psu.edu] | PDF
- [cds.cern.ch] | PDF
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SDSS J160043.6+074802.9: a very rapid sdO pulsator
,
D. Kilkenny,
E. Zietsman,
B. Warner,
N. S. Loaring,
C. Copley,
A. Kniazev,
P. V��is��nen,
M. Still,
R. S. Stobie,
E. B. Burgh,
K. H. Nordsieck,
J. W. Percival,
D. O'Donoghue,
D. A. H. Buckley
Full text: Unavailable
Abstract
We report the serendipitous discovery of the Sloan Digital Sky Survey star, SDSS J160043.6+074802.9 to be a very rapid pulsator. The variation is dominated by a frequency near 8380 microHz (period = 119.33 s) with a large amplitude (0.04 mag) and its first harmonic at 16760 microHz (59.66 s; 0.005 mag). In between these frequencies, we find at least another 8 variations with periods between 62 and 118 seconds and amplitudes between about 0.007 and 0.003 mag; weaker oscillations might also be present. Preliminary spectrograms from the performance verification phase of the Southern African Large Telescope indicate that SDSS J160043.6+074802.9 is a spectroscopic binary consisting of an sdO star and a late-type main-sequence companion. This makes it the first unambiguous detection of such an sdO star to pulsate, and certainly the first found to exhibit multi-frequency variations.