Radial Velocity Variations in Pulsating Ap Stars III. The Discovery of 16.21 min Oscillations in Beta CrB

Abstract

We present the analysis of 3 hrs of a rapid time series of precise stellar radial velocity (RV) measurements (sigma = 4.5 m/s) of the cool Ap star Beta CrB. The integrated RV measurements spanning the wavelength interval 5000-6000 Ang. show significant variations (false alarm probability = 10^-5) with a period of 16.21 min (nu = 1028.17 micro Hz) and an amplitude of 3.54 +/- 0.56 m/s. The RV measured over a much narrower wavelength interval reveals one spectral feature at 6272 Ang. pulsating with the same 16.21 min period and an amplitude of 138 +/- 23 m/s. These observations establish Beta CrB to be a low-amplitude rapidly oscillating Ap star.

5 Pages, 5 figures

References in corpus (1)

• Radial Velocity Variations in Pulsating Ap Stars. II. 33 Librae

Cited by in corpus (26)

• Radial Velocity Detection of Earth-mass Planets in the Presence of Activity Noise: The Case of Alpha Centauri Bb
• Ap stars with resolved magnetically split lines: Magnetic field determinations from Stokes $I$ and $V$ spectra
• Catalogue and Properties of δ Scuti Stars in Binaries
• Discovery of 17 new sharp-lined Ap stars with magnetically resolved lines
• Testing excitation models of rapidly oscillating Ap stars with interferometry
• The Nainital-Cape Survey-III : A Search for Pulsational Variability in Chemically Peculiar Stars
• Discovery of the longest-period rapidly oscillating Ap star HD177765
• The Nainital-Cape Survey-IV
• Discovery of new roAp pulsators in the UVES survey of cool magnetic Ap stars
• A likely exoplanet orbiting the oscillating K-giant α Arietis
• HD 24355 observed by the Kepler K2 mission: A rapidly oscillating Ap star pulsating in a distorted quadrupole mode
• Suppressed phase variations in a high amplitude rapidly oscillating Ap star pulsating in a distorted quadrupole mode
• The radius and effective temperature of the binary Ap star beta CrB from CHARA/FLUOR and VLT/NACO observations
• Time-resolved photometric and spectroscopic analysis of a luminous Ap star HD103498
• The discovery of high-amplitude 10.9-minute oscillations in the cool magnetic Ap star HD 115226
• A spectroscopic analysis of the chemically peculiar star HD207561
• Discovery of very low amplitude 9-minute multiperiodic pulsations in the magnetic Ap star HD 75445
• Short time-scale frequency and amplitude variations in the pulsations of an roAp star: HD 217522
• Whole Earth Telescope discovery of a strongly distorted quadrupole pulsation in the largest amplitude rapidly oscillating Ap star
• Fundamental properties of a selected sample of Ap stars: Inferences from interferometric and asteroseismic constraints
• Asteroseismology of Pulsating Stars
• New light on the driving mechanism in roAp stars. Part I. Effects of metallicity
• A search for rapid pulsations in the magnetic cool chemically peculiar star HD3980
• The search for roAp stars: null results and new candidates from Stroemgren-Crawford photometry
• On the spectroscopic nature of the cool evolved Am star HD151878
• SALT HRS capabilities for time resolved pulsation analysis: a test with the roAp star $\alpha$ Circini