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  Asteroseismic Inference of the Central Structure in a Subgiant Star

Bellinger, E. P., Basu, S., Hekker, S., Chrisensen-Dalsgaard, J., & Ball, W. H. (2021). Asteroseismic Inference of the Central Structure in a Subgiant Star. The Astrophysical Journal, 915(2): 100. doi:10.3847/1538-4357/ac0051.

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Genre: Journal Article

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 Creators:
Bellinger, Earl P., Author
Basu, Sarbani, Author
Hekker, Saskia1, Author              
Chrisensen-Dalsgaard, Jorgen, Author
Ball, Warrick H., Author
Affiliations:
1Max Planck Research Group in Stellar Ages and Galactic Evolution (SAGE), Max Planck Institute for Solar System Research, Max Planck Society, ou_2265636              

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Free keywords: Stellar evolution; Stellar physics; Stellar evolutionary models; Asteroseismology; Stellar oscillations; Stellar ages; Stellar properties
 Abstract: Asteroseismic measurements enable inferences of the underlying stellar structure, such as the density and the speed of sound at various points within the interior of the star. This provides an opportunity to test stellar evolution theory by assessing whether the predicted structure of a star agrees with the measured structure. Thus far, this kind of inverse analysis has only been applied to the Sun and three solar-like main-sequence stars. Here we extend the technique to stars on the subgiant branch, and apply it to one of the best-characterized subgiants of the Kepler mission, HR 7322. The observation of mixed oscillation modes in this star facilitates inferences of the conditions of its inert helium core, nuclear-burning hydrogen shell, and the deeper parts of its radiative envelope. We find that despite significant differences in the mode frequencies, the structure near to the center of this star does not differ significantly from the predicted structure.

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Language(s): eng - English
 Dates: 2021
 Publication Status: Published online
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/ac0051
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Affiliations:
Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 915 (2) Sequence Number: 100 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3