Testing stellar evolution models with the retired A star HD 185351

Publication: Research - peer-reviewJournal article

  • J. G. Hjørringgaard
  • V. Silva Aguirre
  • T. R. White
  • D. Huber
    D. HuberSETI Institute, 189 Bernardo Avenue, Mountain View, CA 94043, USA
  • B. J. S. Pope
    B. J. S. PopeDepartment of Physics (Astrophysics), University of Oxford, DWB, Keble Road, Oxford OX1 3RH, UK
  • L. Casagrande
    L. CasagrandeResearch School of Astronomy and Astrophysics, Mount Stromlo Observatory, The Australian National University, ACT 2611, Australia
  • A. B. Justesen
  • J. Christensen-Dalsgaard
The physical parameters of the retired A star HD 185351 were analysed in great detail by Johnson et al. using interferometry, spectroscopy, and asteroseismology. Results from all independent methods are consistent with HD 185351 having a mass in excess of 1.5 M⊙. However, the study also showed that not all observational constraints could be reconciled in stellar evolutionary models, leading to mass estimates ranging from ˜1.6 to 1.9 M⊙ and casting doubts on the accuracy of stellar properties determined from asteroseismology. Here, we solve this discrepancy and construct a theoretical model in agreement with all observational constraints on the physical parameters of HD 185351. The effects of varying input physics are examined as well as the additional constraint of the observed g-mode period spacing is considered. This quantity is found to be sensitive to the inclusion of additional mixing from the convective core during the main sequence, and can be used to calibrate the overshooting efficiency using low-luminosity red giant stars. A theoretical model with metallicity [Fe/H] = 0.16 dex, mixing-length parameter αMLT = 2.00, and convective overshooting efficiency parameter f = 0.030 is found to be in complete agreement with all observational constraints for a stellar mass of M ≃ 1.60 M⊙.
Original languageEnglish
JournalMonthly Notices of the Royal astronomical Society
Volume464
Issue number3
Pages (from-to)3713-3719
DOIs
StatePublished - 1 Jan 2017
Externally publishedYes

    Keywords

  • asteroseismology, stars: individual: HD 185351, stars: interiors

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