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Testing stellar opacities using asteroseismology

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arxiv 1912.00409 v1 pith:3K7LRBR4 submitted 2019-12-01 astro-ph.SR

classification astro-ph.SR
keywords stellaropacitiesanalysisasteroseismologyastrophysicsaccurateamplitudeba-type
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abstract

We present what constraints on opacities can be derived from the analysis of stellar pulsations of BA-type main-sequence stars. This analysis consists of the construction of complex seismic models which reproduce the observed frequencies as well as the bolometric flux amplitude extracted from the multi-colour photometric variations. Stellar seismology, i.e., {\it asteroseismology}, is a relatively young branch of astrophysics and, currently, provides the most accurate test of the theory of internal structure and evolution. We show that opacities under stellar conditions need to be modified at the depth of temperatures $T=110~000-290~000$\,K. The revision of opacity data is of great importance because they are crucial for all branches of astrophysics.

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  1. Convective shells in the interior of Cepheid variable stars: overshooting models based on hydrodynamic simulations

    astro-ph.SR 2025-05 conditional novelty 6.0 of 10

    A Gamma mixture model of overshooting plume lengths in 2D simulations of six Cepheid models yields a calibrated diffusion coefficient and a tentative relationship between overshooting ratio and shell depth and width.

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