Open AccessRadial velocity variations in pulsating Ap stars – III. The discovery of 16.21‐min oscillations in β CrB
Author(s) -
Hatzes A. P.,
Mkrtichian D. E.
Publication year - 2004
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2004.07816.x
Subject(s) - physics , amplitude , astrophysics , stars , radial velocity , wavelength , star (game theory) , interval (graph theory) , optics , mathematics , combinatorics
We present the analysis of 3 h of a rapid time series of precise stellar radial velocity (RV) measurements (σ= 4.5 m s −1 ) of the cool Ap star β CrB. The integrated RV measurements spanning the wavelength interval 5000–6000 Å show significant variations (false alarm probability = 10 −5 ) with a period of 16.21 min (ν= 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 Å 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.