# The radius and effective temperature of the binary Ap star β CrB from CHARA/FLUOR and VLT/NACO observations

@article{Bruntt2010TheRA,
title={The radius and effective temperature of the binary Ap star $\beta$ CrB from CHARA/FLUOR and VLT/NACO observations},
author={Hans Bruntt and Pierre Kervella and A. M{\'e}rand and Isa M. Brandao and Timothy R. Bedding and Theo A. ten Brummelaar and Vincent Coud{\'e} du Foresto and Margarida S. Cunha and Christopher D. Farrington and P. J. Goldfinger and L{\'a}szl{\'o} L. Kiss and Harold A. Mcalister and Stephen T. Ridgway and Judit Sturmann and Laszlo Sturmann and Nils H. Turner and Peter G. Tuthill},
journal={Astronomy and Astrophysics},
year={2010},
volume={512}
}
• Published 16 December 2009
• Physics
• Astronomy and Astrophysics
Context. The prospects for using the asteroseismology of rapidly oscillating Ap (roAp) stars are hampered by the large uncertainty in fundamental stellar parameters. Results in the literature for the effective temperature (Teff) often span a range of 1000 K. Aims. Our goal is to reduce systematic errors and improve the Teff calibration of Ap stars based on new interferometric measurements. Methods. We obtained long-baseline interferometric observations of β CrB using the CHARA/FLUOR instrument…

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## References

SHOWING 1-10 OF 45 REFERENCES

### The fundamental parameters of the roAp star α Circini

• Physics
• 2008
We have used the Sydney University Stellar Interferometer to measure the angular diameter of α Cir. This is the first detailed interferometric study of a rapidly oscillating A (roAp) star, α Cir

### Asteroseismic analysis of the roAp star α Circini: 84 d of high-precision photometry from the WIRE satellite

• Physics
• 2009
We present a detailed study of the pulsation of α Circini, the brightest of the rapidly oscillating Ap stars. We have obtained 84 d of high-precision photometry from four runs with the star tracker

### The binary nature of the magnetic star β CrB

• Physics
• 1984
The radial velocity of the binary star β CrB was reinvestigated to look for the hypothetical third body, suggested by NEUBAUERS results. Under the assumption that a systematic difference of 1.4

### Radial velocity variations in pulsating Ap stars – III. The discovery of 16.21‐min oscillations in β CrB

• Physics
• 2004
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

### First NACO observations of the Brown Dwarf LHS 2397aB

• Physics
• 2003
Observations of the standard late type M8 star LHS 2397aA were obtained at the ESO-VLT 8 m telescope "Yepun" using the NAOS/CONICA Adaptive Optics facility. The observations were taken during the

### Chemically peculiar stars and their temperature calibration

• Physics
• 2008
Aims. The determination of effective temperature for chemically peculiar (CP) stars by means of photometry is a sophisticated task due to their abnormal colours. Standard calibrations for normal

### Hubble Space Telescope Absolute Spectrophotometry of Vega from the Far-Ultraviolet to the Infrared

• Physics
• 2004
The Space Telescope Imaging Spectrograph (STIS) has measured the absolute flux for Vega from 0.17–1.01 μm on the Hubble Space Telescope white dwarf (WD) flux scale. These data are saturated by up to

### The detection of the very low amplitude 16.2-min pulsation in individual lines of first ionization stage of rare earth elements in the roAp star β CrB

• Physics, Geology
• 2007
With high precision spectroscopic data obtained with Ultraviolet and Visual Echelle Spectrograph (UVES) on the Very Large Telescope (VLT) we detect radial velocity pulsation with a period of 16.2 min

### Evolutionary state of magnetic chemically peculiar stars

• Physics
• 2006
Context. The photospheres of about 5–10% of the upper main sequence stars exhibit remarkable chemical anomalies. Many of these chemically peculiar (CP) stars have a global magnetic field, the origin

### Debris Disks in Main-Sequence Binary Systems

• Physics, Geology
• 2006
We observed 69 A3-F8 main-sequence binary star systems using the Multiband Imaging Photometer for Spitzer on board the Spitzer Space Telescope. We find emission significantly in excess of predicted