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Gaël Buldgen

Global Helioseismology

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Mots-clés : hélioséismologie, physique solaire, abondances solaires

Abstract

Helioseismology is one of the most successful fields of astrophysics. The observation and character-ization of solar oscillation has allowed solar seismologists to study the internal structure and dynamics of the Sun with unprecedented thoroughness. Ground-based networks and dedicated space missions have delivered data of exquisite quality, enabling the development of sophisticated inference techniques. The achievements of the fields count, amongst other, the determination of solar photospheric helium abundance, unacessible to spectroscopic constraints, the precise positioning of the base of the convective zone and the demonstration of the importance of microscopic diffusion in stellar radiative regions. Helioseismology played also a key role in validating the framework used to compute solar and stellar models and played an important role in the so-called solar neutrino problem. In the current era of astrophysics, with the increasing importance of asteroseismology to precisely characterize stars, the Sun still plays a crucial calibration role, acting as a benchmark for stellar models. With the revision of the solar abundances and the current discussions related to radiative opacity computations, the role of the Sun as a laboratory of fundamental physics is undisputable. In this brief review, I will discuss some of the inference techniques developed in the field of helioseismology, dedicated to the exploitation of the solar global oscillation modes.

Keywords : helioseismology, solar physics, solar abundances

To cite this article

Gaël Buldgen, «Global Helioseismology», Bulletin de la Société Royale des Sciences de Liège [En ligne], Volume 88 - Année 2019, Actes de colloques, How Much to we Trust Stellar Models ? - September 2018 - Liège, Belgium, 50-75 URL : https://popups.uliege.be:443/0037-9565/index.php?id=9258.

About: Gaël Buldgen

School of Physics and Astronomy, University of Birmingham, Edgbaston, Birmingham B15 2TT, UK and Observatoire de Genève, Université de Genève, 51 Ch. Des Maillettes, CH-1290 Sauverny, Suisse.