SDSS J160043.6+074802.9: a very rapid sdO pulsator

Type Journal Article
Names P. A. Woudt, D. Kilkenny, E. Zietsman, B. Warner, N. S. Loaring, C. Copley, A. Kniazev, P. Väisänen, M. Still, R. S. Stobie, E. B. Burgh, K. H. Nordsieck, J. W. Percival, D. O'Donoghue, D. A. H. Buckley
Publication Monthly Notices of the Royal Astronomical Society
Volume 371
Issue 3
Pages 1497-1502
Date September 1, 2006
Short Title SDSS J160043.6+074802.9
Library Catalog NASA ADS
Abstract We report the serendipitous discovery of the Sloan Digital Sky Survey (SDSS) star SDSS J160043.6+074802.9 to be a very rapid pulsator. The variation is dominated by a frequency near 8380μHz (period = 119.33s) with a large amplitude (0.04mag) and its first harmonic at 16760μHz (59.66s 0.005mag). In between these frequencies, we find at least another eight variations with periods between 62 and 118s and amplitudes between about 0.007 and 0.003mag 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 multifrequency variations.
Tags STARS: OSCILLATIONS, stars: individual: SDSS J160043.6+074802.9, stars: individual: SDSS J160043.6+074802.9: stars: oscillations: stars: variables: other, stars: variables: other
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