Asteroseismic Inference of the Central Structure in a Subgiant Star

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.

SEEK ID: https://publications.h-its.org/publications/1364

DOI: 10.3847/1538-4357/ac0051

Research Groups: Theory and Observations of Stars

Publication type: Journal

Journal: The Astrophysical Journal

Citation: ApJ 915(2):100

Date Published: 13th Jul 2021

Registered Mode: by DOI

Authors: Earl P. Bellinger, Sarbani Basu, Saskia Hekker, Jørgen Christensen-Dalsgaard, Warrick H. Ball

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Citation
Bellinger, E. P., Basu, S., Hekker, S., Christensen-Dalsgaard, J., & Ball, W. H. (2021). Asteroseismic Inference of the Central Structure in a Subgiant Star. In The Astrophysical Journal (Vol. 915, Issue 2, p. 100). American Astronomical Society. https://doi.org/10.3847/1538-4357/ac0051
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Created: 9th Dec 2021 at 08:45

Last updated: 5th Mar 2024 at 21:24

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