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The effect of Coulomb interactions on acoustic oscillations in the outer layers of low-mass stars

Published online by Cambridge University Press:  23 December 2024

Ana Brito Open the ORCID record for Ana Brito [Opens in a new window]  and
Ilídio Lopes Fuentes
Ana Brito*
Affiliation:
Instituto Superior de Gestão Rua Prof. Reinaldo dos Santos 46, 1500-522, Lisbon, Portugal Centro de Astrofsica e Gravitação - CENTRA, Departamento de Fsica, Instituto Superior Técnico, Universidade de Lisboa Av. Rovisco Pais 1, 1049-001, Lisbon, Portugal
Ilídio Lopes Fuentes*
Affiliation:
Centro de Astrofsica e Gravitação - CENTRA, Departamento de Fsica, Instituto Superior Técnico, Universidade de Lisboa Av. Rovisco Pais 1, 1049-001, Lisbon, Portugal
*
email: anabrito@isg.pt
email: ilidio.lopes@tecnico.ulisboa.pt
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Abstract

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As is well known, low-mass stars constitute the most abundant class of stars in our galaxy. In stars less massive than the Sun, the density within stellar interiors increases as the stellar mass decreases. Therefore, for low-mass stars, the significance of electrostatic effects in stellar interiors cannot be neglected, as these interactions can alter the properties of matter.

In our study, we focus on exploring the outer layers of stars less massive than the Sun. We have computed a range of stellar models, ranging from 0.4 to 0.9 solar masses, to investigate the effects of two physical processes on the acoustic oscillations in the envelopes of these stars: partial ionization of chemical elements and electrostatic interactions between particles in the outer layers. In addition to partial ionization, we demonstrate that Coulomb effects also influence the acoustic oscillation spectrum. Our investigation reveals the following findings:

1. Coulomb effects can indeed influence the acoustic oscillations in low-mass stars.

2. The model with a mass of inline1 serves as a transition point. For models less massive than inline1, their acoustic spectrum is more affected by electrostatic interactions, whereas models more massive than inline1 have their acoustic spectrum more impacted by partial ionization processes.

Our work unveils the promising possibilities that future discoveries related to the detection of solar-like oscillations in stars less massive than the Sun could offer in terms of understanding the connections between the internal structure of low-mass stars and their observable characteristics.

Keywords

AsteroseismologyLow-mass starsStellar interiorsCoulomb effectsPartial ionization
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 19 , Symposium S365: Dynamics of Solar and Stellar Convection Zones and Atmospheres , December 2023 , pp. 250 - 256
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of International Astronomical Union

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