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

Christensen-Dalsgaard, J., Silva Aguirre, V., Cassisi, S., Miller Bertolami, M., Serenelli, A., Stello, D., et al. (2020). The Aarhus red giants challenge: II. Stellar oscillations in the red giant branch phase. Astronomy and Astrophysics, 635: A165. doi:10.1051/0004-6361/201936766.

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Christensen-Dalsgaard, J., Author
Silva Aguirre, V. , Author
Cassisi, S., Author
Miller Bertolami, M. , Author
Serenelli, A., Author
Stello, D., Author
Weiss, A., Author
Angelou, George C.1, Author              
Jiang, C., Author
Lebreton, Y., Author
Spada, Federico2, Author              
Bellinger, Earl P.1, Author              
Deheuvels, S., Author
Ouazzani, R. M., Author
Pietrinferni, A., Author
Mosumgaard, J. R., Author
Townsend, R. H. D., Author
Battich, T., Author
Bossini, D., Author
Constantino, T., Author
Eggenberger, P., AuthorHekker, Saskia1, Author              Mazumdar, A., AuthorMiglio, A., AuthorNielsen, K. B., AuthorSalaris, M., Author more..
1Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              
2Department Solar and Stellar Interiors, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832287              


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 Abstract: Contact. The large quantity of high-quality asteroseismic data that have been 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 and other asteroseismic diagnostics. 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. This is particularly true for the nonradial modes whose mixed acoustic and gravity-wave character makes them sensitive to the structure of the deep stellar interior and, hence, to details of their evolution. 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 and improve our understanding of stellar internal physics. However, our analysis of the frequency differences and their relation to stellar internal properties provides a striking illustration of the potential, in particular, of the mixed modes of red-giant stars for the diagnostics of stellar interiors.


Language(s): eng - English
 Dates: 2020
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1051/0004-6361/201936766
 Degree: -



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Source 1

Title: Astronomy and Astrophysics
  Other : Astron. Astrophys.
Source Genre: Journal
Publ. Info: Les Ulis Cedex A France : EDP Sciences
Pages: 21 Volume / Issue: 635 Sequence Number: A165 Start / End Page: - Identifier: ISSN: 1432-0746
ISSN: 0004-6361
CoNE: https://pure.mpg.de/cone/journals/resource/954922828219_1