Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 371, Issue 3, Pages 1497-1502Publisher
BLACKWELL PUBLISHING
DOI: 10.1111/j.1365-2966.2006.10788.x
Keywords
stars : individual; SDSS J160043.6+074802.9; stars : oscillations; stars : variables : other
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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 8380 mu Hz (period = 119.33 s) with a large amplitude (0.04 mag) and its first harmonic at 16760 mu Hz (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.
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