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Faculté des Sciences
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MASTER THESIS
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Modelling and seismic probing of core-helium burning stars with mixed modes

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Panier, Lucy ULiège
Promotor(s) : Dupret, Marc-Antoine ULiège ; Van Grootel, Valérie ULiège
Date of defense : 7-Sep-2023/8-Sep-2023 • Permalink : http://hdl.handle.net/2268.2/18767
Details
Title : Modelling and seismic probing of core-helium burning stars with mixed modes
Translated title : [fr] Modélisation et étude sismique d'étoiles en combustion d'helium avec des modes mixtes
Author : Panier, Lucy ULiège
Date of defense  : 7-Sep-2023/8-Sep-2023
Advisor(s) : Dupret, Marc-Antoine ULiège
Van Grootel, Valérie ULiège
Committee's member(s) : De Becker, Michaël ULiège
Grötsch-Noels, Arlette ULiège
Buldgen, Gaël ULiège
Language : English
Number of pages : 103
Keywords : [en] asteroseismology
[en] stellar physics
[en] astrophysics
Discipline(s) : Physical, chemical, mathematical & earth Sciences > Space science, astronomy & astrophysics
Target public : Student
Institution(s) : Université de Liège, Liège, Belgique
Degree: Master en sciences spatiales, à finalité approfondie
Faculty: Master thesis of the Faculté des Sciences

Abstract

[en] The study of stellar pulsations known as Asteroseismology provides insights into internal structures and dynamics of stars. In particular, red giant stars exhibit coupled oscillation modes known as mixed mode, which are important for distinctly probing the core and envelope. The recent space missions such as Kepler and CoRoT have led to useful advances in the asteroseismology of red giant stars. In this thesis, we study low-mass red giant stars undergoing helium burning in their convective core during their evolution on the Horizontal Branch. The primary focus is on analysing the core physical parameters throughout the evolution and then some features of mixed modes such as the Brunt–Väisälä frequency and the period spacing are investigated. The effects of envelope mass and core size on these different parameters are explored. The stellar evolution code Clés (Code Liégeois d’Évolution Stellaire), developed within the Department of Astrophysics, Geophysics and Oceanography of the University of Liège, is used to provide the evolution sequences, and then a simplified model based on polytropes is developed in Python code to complement the study. The latter provides a simpler framework to interpret the trend in the central physical parameters over the course of the evolution.


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Author

  • Panier, Lucy ULiège Université de Liège > Master sc. spatiales, à fin.

Promotor(s)

Committee's member(s)

  • De Becker, Michaël ULiège Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Origines Cosmologiques et Astrophysiques (OrCa)
    ORBi View his publications on ORBi
  • Grötsch-Noels, Arlette ULiège Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Département d'astrophys., géophysique et océanographie (AGO)
    ORBi View his publications on ORBi
  • Buldgen, Gaël ULiège Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique stellaire théorique et astérosismologie
    ORBi View his publications on ORBi
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  • Total number of downloads 18










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