FUNDAMENTAL PROPERTIES OF STARS USING ASTEROSEISMOLOGY FROM KEPLER AND CoRoT AND INTERFEROMETRY FROM THE CHARA ARRAY

By D. Huber, Michael J. Ireland, T. Bedding, I. Brandao, L. Piau, V. Maestro, T. White, H. Bruntt, Luca Casagrande, J. Molenda–Żakowicz and 30 more. 2012

188 citations recorded by the source corpus.

We present results of a long-baseline interferometry campaign using the PAVO beam combiner at the CHARA Array to measure the angular sizes of five main-sequence stars, one subgiant and four red giant stars for which solar-like oscillations have been detected by either Kepler or CoRoT. By combining interferometric angular diameters, Hipparcos parallaxes, asteroseismic densities, bolometric fluxes, and high-resolution spectroscopy, we derive a full set of near-model-independent fundamental properties for the sample. We first use these properties to test asteroseismic scaling relations for the frequency of maximum power (νmax) and the large frequency separation (Δν). We find excellent agreement within the observational uncertainties, and empirically show that simple estimates of asteroseismic radii for main-sequence stars are accurate to ≲ 4%. We furthermore find good agreement of our measured effective temperatures with spectroscopic and photometric estimates with mean deviations for stars between Teff = 4600–6200 K of −22 ± 32 K (with a scatter of 97 K) and −58 ± 31 K (with a scatter of 93 K), respectively. Finally, we present a first comparison with evolutionary models, and find differences between observed and theoretical properties for the metal-rich main-sequence star HD 173701. We conclude that the constraints presented in this study will have strong potential for testing stellar model physics, in particular when combined with detailed modeling of individual oscillation frequencies.

Subfields: Astronomy and Astrophysics, Geophysics

View Paper: https://www.semanticscholar.org/paper/204ab55b4a81ab737dc99993b5f6988f110cf113

How researchers see this paper

The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.

In Astronomy and Astrophysics

1. D. Huber
2. Hans-Walter Rix
3. Jo Bovy
4. W. Chaplin
5. D. Stello
6. Martin Asplund
7. I. Minchev
8. A. Miglio

In Geophysics

1. S. Basu
2. Laurent Gizon

Citations in the corpus

• Gaia FGK benchmark stars: Effective temperatures and surface gravities (2015, methodology): “Furthermore, Huber et al. (2012) measured the angular diameters of ten bright oscillating stars observed by Kepler or CoRoT with the CHARA array.”
• ECCENTRICITY FROM TRANSIT PHOTOMETRY: SMALL PLANETS IN KEPLER MULTI-PLANET SYSTEMS HAVE LOW ECCENTRICITIES (2015, background): “Such relations have been proven accurate and unbiased for dwarfs and subdwarfs, such as the stars considered in this study (Huber et al. 2012; Silva Aguirre et al. 2012, 2015).”
• Mixed modes in red giants: a window on stellar evolution (2014, background): “The precision is 15–25% in mass, 5–10% in radius, 15–25% in luminosity (Huber et al. 2012; Silva Aguirre et al. 2012).”
• Confirming chemical clocks: asteroseismic age dissection of the Milky Way disc(s) (2017, background): “Several tests carried out on the scaling relations suggest they are accurate to a level of a few percent (see e.g. Huber et al. 2012; Silva Aguirre et al. 2012; White et al. 2013; Miglio et al. 2013a, 2016; Gaulme et al. 2016; Huber et al. 2017).”
• REVISED STELLAR PROPERTIES OF KEPLER TARGETS FOR THE QUARTER 1–16 TRANSIT DETECTION RUN (2013, background): “…25 http://keplerscience.arc.nasa.gov/ • Asteroseismology: Stellar oscillations provide accurate measurements of stellar properties such as density and surface gravity (Stello et al. 2008; Bedding 2011; Miglio et al. 2012; Huber et al. 2012; Silva Aguirre et al. 2012; Hekker et al. 2013).”
• A new correction of stellar oscillation frequencies for near-surface effects (2014, background): “…been identified in dozens of stars (e.g. Appourchaux et al. 2012) for which many have complementary spectroscopic observations (e.g Bruntt et al. 2012; Molenda-Żakowicz et al. 2013) and a handful additionally have interferometric constraints on their radii (Huber et al. 2012; White et al. 2013).”
• Galactic archaeology: mapping and dating stellar populations with asteroseismology of red-giant stars (2012, methodology): “…of mass and radius suggest that R and M derived using average asteroseismic parameters are accurate to within 5% and 10%, respectively (see Miglio et al. 2012 for a review on the tests performed so far, see Miglio (2012); Silva Aguirre et al. (2012); Huber et al. (2012) for tests on nearby stars).”
• PLATO as it is: a legacy mission for Galactic archaeology (2017, unknown): “…testing the accuracy of the seismic distance scale, benefiting from negligible extinction as well as exquisite seismic, spectroscopic, photometric, and astrometric data, and, for some targets, interferometric constraints (e.g., see Huber et al. 2012; Lagarde et al. 2015; Silva Aguirre et al. 2012).”
• THE APOKASC CATALOG: AN ASTEROSEISMIC AND SPECTROSCOPIC JOINT SURVEY OF TARGETS IN THE KEPLER FIELDS (2014, methodology): “Our radii are based on the same scaling relations used in Silva Aguirre et al. (2012) and Huber et al. (2012), which reported good agreement with independent tests using stars with measured parallaxes and interferometric angular size measurements, particularly at solar metallicity.”
• Improvements to stellar structure models, based on a grid of 3D convection simulations. II. Calibrating the mixing-length formulation (2014, methodology): “…et al. (2010) based on observations of solar twins (stars that are spectroscopically and photometrically indistinguishable from the Sun), and by Huber et al. (2012) based on asteroseismic analysis of Kepler and CoRoT observations, coupled with interferometric measurements of stellar radii.”
• Ages and fundamental properties of Kepler exoplanet host stars from asteroseismology (2015, background): “Studies have shown that radii of main-sequence stars predicted from asteroseismology agree with determinations from parallaxes and interferometry (Silva Aguirre et al. 2012; Huber et al. 2012; White et al. 2013), while asteroseismic masses still remain to be confirmed by independent measurements.”
• Asteroseismology of Solar-Type and Red-Giant Stars (2013, background): “Huber et al. (2012) combined interferometric observations of some of the brightest Kepler and CoRoT targets with Hipparcos parallaxes, and also found excellent agreement with the scaling-relation inferred stellar radii, at the 5% level.”