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}
}
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… 

Figures and Tables from this paper

The fundamental parameters of the roAp star 10 Aquilae
Due to the strong magnetic field and related abnormal surface layers existing in rapidly oscillating Ap stars, systematic errors are likely to be present when determining their effective
The fundamental parameters of the roAp star γ Equulei
Context. A precise comparison of the predicted and observed locations of stars in the H-R diagram is needed when testing stellar interior theoretical models. For doing this, one must rely on
The fundamental parameters of the roAp star HD 24712 - A rapidly oscillator at the red edge of the instability strip
Context. There is still a debate about the nature of the mechanism that causes the pulsation excitation of the rapidly oscillating Ap stars that oscillate above the highest theoretically acoustic
Benchmarking the fundamental parameters of Ap stars with optical long-baseline interferometric measurements
Context. The variety of physical processes at play in chemically peculiar stars makes it difficult to determine their fundamental parameters. In particular, for the magnetic ones, called Ap stars,
Fundamental parameters and evolutionary status of the magnetic chemically peculiar stars HD 188041 (V1291 Aquilae), HD 111133 (EP Virginis), and HD 204411: spectroscopy versus interferometry
The determination of fundamental parameters of stars is one of the main tasks of astrophysics. For magnetic chemically peculiar stars, this problem is complicated by the anomalous chemical
Fundamental parameters of bright Ap stars from wide-range energy distributions and advanced atmospheric models
Aims. As a well-established procedure for the vast majority of normal main-sequence stars, determination of atmospheric and stellar parameters turns to be a challenging process in case of magnetic
Interferometry of chemically peculiar stars: theoretical predictions versus modern observing facilities
By means of numerical experiments we explore the application of interferometry to the detection and characterization of abundance spots in chemically peculiar (CP) stars using the brightest star e
Rotation and pulsation in Ap stars: first light results from TESS sectors 1 and 2
We present the first results from the Transiting Exoplanet Survey Satellite (TESS) on the rotational and pulsational variability of magnetic chemically peculiar A-type stars. We analyse TESS 2-min
Asteroseismology of Pulsating Stars
The success of helioseismology is due to its capability of measuring p-mode oscillations in the Sun. This allows us to extract information on the internal structure and rotation of the Sun from the
Testing excitation models of rapidly oscillating Ap stars with interferometry
Rapidly oscillating Ap stars are unique objects in the potential they offer to study the interplay between a number of important physical phenomena, in particular, pulsations, magnetic fields,
...
1
2
3
...

References

SHOWING 1-10 OF 48 REFERENCES
The fundamental parameters of the roAp star α Circini
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
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
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
A photometric search for rapid oscillations in the cool Ap star β CrB near magnetic maximum
Photoelectric photometry has been obtained on 8 nights, all within one day of the magnetic maximum of β CrB based on Kurtz' ephemeris, in order to attempt to clarify whether this cool magnetic
Radial velocity variations in pulsating Ap stars – III. The discovery of 16.21‐min oscillations in β CrB
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
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
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
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
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
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
...
1
2
3
4
5
...