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Wiley InterScience | |||
  Monthly Notices of the Royal Astronomical SocietySee Also: Volume 371 Issue 3, Pages 1497 - 1502 Published Online: 22 Aug 2006 Journal compilation © 2010 RAS A Journal of the Royal Astronomical Society
Abstract | References | Full Text: HTML, PDF (Size: 793K) | Related Articles | Citation Tracking  SDSS J160043.6+074802.9: a very rapid sdO pulsator Copyright 2006 The Authors. Journal compilation © 2006 RAS KEYWORDS stars: individual: SDSS J160043.6+074802.9 • stars: oscillations • stars: variables: other. ABSTRACTWe 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 8380 μHz (period = 119.33 s) with a large amplitude (0.04 mag) and its first harmonic at 16760 μHz (59.66 s; 0.005 mag). In between these frequencies, we find at least another eight variations with periods between 62 and 118 s 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 multifrequency variations. Accepted 2006 July 8. Received 2006 July 7; in original form 2006 May 22 | 
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