Observations of the red giant Arcturus (α Boo) obtained with the star tracker on the Wide Field Infrared Explorer ( WIRE ) satellite during a baseline of 19 successive days in 2000 July-August are analyzed. The amplitude spectrum has a significant excess of power at low frequencies. The highest peak is at ~4.1 μHz (2.8 days), which is in agreement with previous ground-based radial velocity studies. The variability of Arcturus can be explained by sound waves, but it is not clear whether these are coherent p -mode oscillations or a single mode with a short lifetime.
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Retter et al. (2003) studied this question.
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