The Aarhus red giants challenge: II. Stellar oscillations in the red giant branch phase

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  • J. Christensen-Dalsgaard
  • V. Silva Aguirre
  • S. Cassisi, INAF-Astronomical Observatory of Abruzzo, INFN Sezione di Pisa
  • ,
  • M. Miller Bertolami, Instituto de Astrofísica de La Plata, UNLP-CONICET, Facultad de Ciencias Astronómicas y Geofísicas, UNLP, La Plata, Argentina, Max-Planck-Institut für Astrophysics
  • ,
  • A. Serenelli, Instituto de Ciencias del Espacio (ICE-CSIC/IEEC), Institut d'Estudis Espacials de Catalunya (IEEC)
  • ,
  • D. Stello
  • A. Weiss, Max-Planck-Institut für Astrophysics
  • ,
  • G. Angelou, Max-Planck-Institut für Astrophysics, Max-Planck-Institut für Sonnensystemforschung
  • ,
  • C. Jiang, Sun Yat-Sen University
  • ,
  • Y. Lebreton, LESIA, Observatoire de Paris, CNRS, Université de Rennes
  • ,
  • F. Spada, Max-Planck-Institut für Sonnensystemforschung
  • ,
  • E. P. Bellinger
  • S. Deheuvels, Université de Toulouse
  • ,
  • R. M. Ouazzani, LESIA, Observatoire de Paris
  • ,
  • A. Pietrinferni, INAF-Astronomical Observatory of Abruzzo
  • ,
  • J. R. Mosumgaard
  • R. H. D. Townsend, Department of Astronomy, 2535 Sterling Hall 475 N. Charter Street, Madison, WI, 53706-1582, USA
  • ,
  • T. Battich, Instituto de Astrofísica de La Plata, UNLP-CONICET, Facultad de Ciencias Astronómicas y Geofísicas, UNLP, La Plata, Argentina
  • ,
  • D. Bossini, Universidade do Porto, University of Birmingham
  • ,
  • T. Constantino, University of Exeter
  • ,
  • P. Eggenberger, Université de Genève
  • ,
  • S. Hekker, Max-Planck-Institut für Sonnensystemforschung
  • ,
  • A. Mazumdar, Homi Bhabha Centre for Science Education, TIFR
  • ,
  • A. Miglio, University of Birmingham
  • ,
  • K. B. Nielsen
  • ,
  • M. Salaris, Liverpool John Moores University
Context. The large quantity of high-quality asteroseismic data that obtained from space-based photometric missions and the accuracy of the resulting frequencies motivate a careful consideration of the accuracy of computed oscillation frequencies of stellar models, when applied as diagnostics of the model properties. Aims. Based on models of red-giant stars that have been independently calculated using different stellar evolution codes, we investigate the extent to which the differences in the model calculation affect the model oscillation frequencies. Methods. For each of the models, which cover four different masses and different evolution stages on the red-giant branch, we computed full sets of low-degree oscillation frequencies using a single pulsation code and, from these frequencies, typical asteroseismic diagnostics. In addition, we carried out preliminary analyses to relate differences in the oscillation properties to the corresponding model differences. Results. In general, the differences in asteroseismic properties between the different models greatly exceed the observational precision of these properties, in particular for the nonradial modes whose mixed acoustic and gravity-wave character makes them sensitive to the structure of the deep stellar interior. In some cases, identifying these differences led to improvements in the final models presented here and in Paper I; here we illustrate particular examples of this. Conclusions. Further improvements in stellar modelling are required in order fully to utilise the observational accuracy to probe intrinsic limitations in the modelling. However, our analysis of the frequency differences and their relation to stellar internal properties provides a striking illustration of the potential of the mixed modes of red-giant stars for the diagnostics of stellar interiors.
OriginalsprogEngelsk
ArtikelnummerA165
TidsskriftAstronomy & Astrophysics
Vol/bind635
ISSN0004-6361
DOI
StatusUdgivet - mar. 2020

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