Establishing the accuracy of asteroseismic mass and radius estimates of giant stars - I. Three eclipsing systems at [Fe/H] similar to-0.3 and the need for a large high-precision sample

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  • K. Brogaard
  • C. J. Hansen, Univ Copenhagen, Niels Bohr Institute, University of Copenhagen, Niels Bohr Inst, Dark Cosmol Ctr,
  • A. Miglio
  • D. Slumstrup
  • S. Frandsen
  • J. Jessen-Hansen
  • M. N. Lund
  • D. Bossini, Univ Birmingham, University of Birmingham, Sch Phys & Astron, A. Thygesen, CALTECH, California Institute of Technology, G. R. Davies, Univ Birmingham, University of Birmingham, Sch Phys & Astron, W. J. Chaplin, Univ Birmingham, University of Birmingham, Sch Phys & Astron,
  • T. Arentoft
  • H. Bruntt,
  • F. Grundahl
  • R. Handberg

We aim to establish and improve the accuracy level of asteroseismic estimates of mass, radius, and age of giant stars. This can be achieved by measuring independent, accurate, and precise masses, radii, effective temperatures and metallicities of long period eclipsing binary stars with a red giant component that displays solar-like oscillations. We measured precise properties of the three eclipsing binary systems KIC 7037405, KIC 9540226, and KIC 9970396 and estimated their ages be 5.3 +/- 0.5, 3.1 +/- 0.6, and 4.8 +/- 0.5 Gyr. The measurements of the giant stars were compared to corresponding measurements of mass, radius, and age using asteroseismic scaling relations and grid modelling. We found that asteroseismic scaling relations without corrections to Ay systematically overestimate the masses of the three red giants by 11.7 per cent, 13.7 per cent, and 18.9 per cent, respectively. However, by applying theoretical correction factors f Delta nu according to Rodrigues et al. (2017), we reached general agreement between dynamical and asteroseismic mass estimates, and no indications of systematic differences at the precision level of the asteroseismic measurements. The larger sample investigated by Gaulme et al. (2016) showed a much more complicated situation, where some stars show agreement between the dynamical and corrected asteroseismic measures while others suggest significant overestimates of the asteroseismic measures. We found no simple explanation for this, but indications of several potential problems, some theoretical, others observational. Therefore, an extension of the present precision study to a larger sample of eclipsing systems is crucial for establishing and improving the accuracy of asteroseismology of giant stars.

Original languageEnglish
JournalRoyal Astronomical Society. Monthly Notices
Issue number3
Pages (from-to)3729-3743
Number of pages15
StatePublished - May 2018

    Research areas

  • binaries, eclipsing-stars, evolution-stars, fundamental parameters-stars, individual, MC 7037405, KIC 9540226, KIC 9970396-Galaxy, stellar content, SOLAR-LIKE OSCILLATIONS, OPEN CLUSTERS, LIGHT CURVES, KEPLER, BINARIES, MISSION, PARAMETERS, SPECTRA, CATALOG, AGES

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