# The radii of the nearby K5V and K7V stars 61 Cygni A & B. CHARA/FLUOR interferometry and CESAM2k modeling

@article{Kervella2008TheRO,
title={The radii of the nearby K5V and K7V stars 61 Cygni A \& B. CHARA/FLUOR interferometry and CESAM2k modeling},
author={Pierre Kervella and Antoine M'erand and Bernard Pichon and Fr'ed'eric Th'evenin and Ulrike Heiter and Lionel Bigot and Theo A. ten Brummelaar and Harold A. Mcalister and Stephen T. Ridgway and Nils H. Turner and Judit Sturmann and Laszlo Sturmann and P. J. Goldfinger and Christopher D. Farrington},
journal={Astronomy and Astrophysics},
year={2008},
volume={488},
pages={667-674}
}
• Published 25 June 2008
• Physics, Geology
• Astronomy and Astrophysics
Context: The main sequence binary star 61 Cyg (K5V+K7V) is our nearest stellar neighbour in the northern hemisphere. This proximity makes it a particularly well suited system for very high accuracy interferometric radius measurements. Aims: Our goal is to constrain the poorly known evolutionary status and age of this bright binary star. Methods: We obtained high accuracy interferometric observations in the infrared K' band, using the CHARA/FLUOR instrument. We then computed evolutionary models…
58 Citations

## Figures and Tables from this paper

A near-infrared interferometric survey of debris-disc stars - III. First statistics based on 42 stars observed with CHARA/FLUOR
• Physics, Geology
• 2013
Context. Dust is expected to be ubiquitous in extrasolar planetary systems owing to the dynamical activity of minor bodies. Inner dust populations are, however, still poorly known because of the high
Fundamental properties of the Population II fiducial stars HD 122563 and Gmb 1830 from CHARA interferometric observations
• Physics
• 2012
We have determined the angular diameters of two metal-poor stars, HD 122563 and Gmb 1830, using CHARA and Palomar Testbed Interferometer observations. For the giant star HD 122563, we derive an
Benchmark stars for Gaia Fundamental properties of the Population II star HD 140283 from interferometric, spectroscopic, and photometric data
• Physics
• 2015
Metal-poor halo stars are important astrophysical laboratories that allow us to unravel details about many aspects of astrophysics, including the chemical conditions at the formation of our Galaxy,
Stellar Diameters and Temperatures. II. Main-sequence K- and M-stars
• Physics
• 2012
We present interferometric angular diameter measurements of 21 low-mass, K- and M-dwarfs made with the CHARA Array. This sample is enhanced by adding a collection of radius measurements published in
Lyα Observations of High Radial Velocity Low-mass Stars Ross 1044 and Ross 825
• Physics, Geology
The Astrophysical Journal
• 2019
The discovery of habitable zone (HZ) planets around low-mass stars has highlighted the need for a comprehensive understanding of the radiation environments in which such planets reside. Of particular
Towards stellar effective temperatures and diameters at 1 per cent accuracy for future surveys
• Physics, Geology
• 2014
The apparent size of stars is a crucial benchmark for fundamental stellar properties such as effective temperatures, radii and surface gravities. While interferometric measurements of stellar angular
Characterizing the Cool Kepler Objects of Interests. New Effective Temperatures, Metallicities, Masses, and Radii of Low-mass Kepler Planet-candidate Host Stars
• Physics, Geology
• 2011
We report stellar parameters for late-K and M-type planet-candidate host stars announced by the Kepler Mission. We obtained medium-resolution, K-band spectra of 84 cool (T_eff ≲ 4400 K) Kepler
Mass-radius relation of low and very low-mass stars revisited with the VLTI
• Physics
• 2009
We measured the radii of 7 low and very low-mass stars using long baseline interferometry with the VLTI interferometer and its VINCI and AMBER near-infrared recombiners. We use these new data,
Asteroseismology and interferometry of the red giant star Ophiuchi
• Physics, Geology
• 2009
The GIII red giant starOph has been found to exhibit several modes of oscillation by the MOST mission. We interpret the observed frequencies of oscillation in terms of theoretical radial p-mode
Coronal activity cycles in nearby G and K stars - XMM-Newton monitoring of 61 Cygni and α Centauri
• Physics
• 2012
We use X-ray observations of the nearby binaries 61 Cyg A/B (K5V and K7V) and Alpha Cen A/B (G2V and K1V) to study the long-term evolution of magnetic activity in weakly to moderately active G + K

## References

SHOWING 1-10 OF 63 REFERENCES
The interferometric diameter and internal structure of Sirius A
• Physics
• 2003
The interferometric observations of dwarf stars in the solar neighbourhood, combined with Hipparcos parallaxes provide very precise values of their linear diameters. In this paper, we report the
The diameters of $\alpha$ Centauri A and B - A comparison of the asteroseismic and VINCI/VLTI views
• Physics
• 2003
We compare the first direct angular diameter measurements obtained on our closest stellar neighbour, Centauri, to recent model diameters constrained by asteroseismic observations. Using the VINCI
The limb darkening of $\mathsf{\alpha}$ Centauri B - Matching 3D hydrodynamical models with interferometric measurements
• Physics, Geology
• 2006
For the nearby dwarf star α  Cen B (K1 V), we present limb-darkening predictions from a 3D hydrodynamical radiative transfer model of its atmosphere. We first compared the results of this model to a
Metallicity and photospheric abundances in field K and M dwarfs
• Physics
• 1998
Elemental abundances in late-type stars are of interest in several ways: they determine the location of the stars in the HR diagram and therefore their ages, as well as the atmospheric structure in
Spectroscopic determination of photospheric parameters and chemical abundances of 6 K-type stars
• Physics
• 2005
High resolution, high -S /N- ratio optical spectra have been obtained for a sample of 6 K-type dwarf and subgiant stars, and have been analysed with three different LTE methods in order to derive
Improved Color-Temperature Relations and Bolometric Corrections for Cool Stars
• Physics, Geology
• 1999
We present new grids of colors and bolometric corrections for F-K stars having 4000 K ≤ Teff ≤ 6500 K, 0.0 ≤ log g ≤ 4.5, and -3.0 ≤ [Fe/H] ≤ 0.0. A companion paper extends these calculations into
A grid of MARCS model atmospheres for late-type stars. I. Methods and general properties
• Physics
• 2008
Context. In analyses of stellar spectra and colours, and for the analysis of integrated light from galaxies, a homogeneous grid of model atmospheres of late-type stars and corresponding flux spectra
A catalog of bright calibrator stars for 200-m baseline near-infrared stellar interferometry
• Physics
• 2005
We present in this paper a catalog of reference stars suitable for calibrating infrared interferometric observations. In the K band, visibilities can be calibrated with a precision of 1% on baselines
On the limb darkening, spectral energy distribution, and temperature structure of procyon
We have fit synthetic visibilities from three-dimensional ((COBOLD)-B-5+PHOENIX) and one-dimensional (PHOENIX, ATLAS 12) model stellar atmospheres of Procyon (F5 IV) to high-precision interferometric
Dwarfs in the Local Region
• Physics, Geology
• 2006
We present lithium, carbon, and oxygen abundance data for a sample of nearby dwarfs—a total of 216 stars—including samples within 15 pc of the Sun, as well as a sample of local close giant planet