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Sismologie solaire et stellaire

Abstract : The thesis presented here takes place within the framework of the seismology of the Sun and stars, in a transition period between the good knowledge of the Sun thanks to the helioseismology and a current development of the asteroseismology, and, between a static and a dynamic vision of stars. The purpose of my work was to participate in this effort to exceed the static vision of the stellar inside and through the development of data analysis tools for space missions. So the current standard solar model, the theoretical representation of the solar interior, presents limits, emphases by a recent revision of its abundances. We show that the discrepancy between the standard model and the seismic observations is strongly degraded, motivating the introduction of dynamic processes in the models. We also introduced magnetic effects in the superficial layers to improve the prediction of the frequencies and the seismic analysis. The asteroseismic present and future space missions allow us to have access to information on the dynamics of stars (rotation, convection, . . .). To improve this information, contained in the oscillation spectra, it is necessary to proceed a good identification of the modes as well as an accurate extraction of these parameters. We show how to improve this by developing an analysis of the echelle diagramme based on the recent curvelet transform. This method has been validated thanks to simulations and within the framework of exercises for the preparation for the CoRoT mission. We have also analysed the case of the star Procyon as observed by the MOST mission.
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Contributor : Pascal Lambert <>
Submitted on : Monday, December 7, 2009 - 8:42:05 AM
Last modification on : Friday, April 10, 2020 - 5:28:53 PM
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  • HAL Id : tel-00140766, version 3


Pascal Lambert. Sismologie solaire et stellaire. Astrophysique [astro-ph]. Université Paris-Diderot - Paris VII, 2007. Français. ⟨tel-00140766v3⟩



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