Abstract
We present the analysis of 3 h of a rapid time series of precise stellar radial velocity (RV) measurements (a = 4.5 m s -1 ) of the cool Ap star β CrB. The integrated RV measurements spanning the wavelength interval 5000-6000 A show significant variations (false alarm probability = 10 -5 ) with a period of 16.21 min (v = 1028.17 μHz) and an amplitude of 3.54 ± 0.56 m s -1 The RV measured over a much narrower wavelength interval reveals one spectral feature at λ6272.0 A pulsating with the same 16.21-min period and an amplitude of 138 ± 23 m s -1 . These observations establish β CrB to be a low-amplitude rapidly oscillating Ap star.
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