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English (2)


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2019 (2)

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Dissertation
Convection in pulsating white dwarfs
Authors: --- --- --- --- --- et al.
Year: 2019 Publisher: Liège Université de Liège (ULiège)

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Abstract

In this work, the emphasis will be placed on the understating of the theory needed to try
to describe correctly the interaction between convection and pulsation. We will shed light on
important terms appearing due to turbulent flows and see how we can describe them. Hence,
we will present more evolved models that should reproduce the reality with a better fidelity.
Finally, to illustrate and compare the different possible models introduced previously, we will
study a well-known type of variable stars: the ZZ Ceti white dwarfs. These dying stars are
known for their extremely thin but efficient convection envelope (as most white dwarfs) and
for their instability strip for which better predictions are still needed in order to match the
observations. Dans ce travail, l'emphase sera mise sur la compréhension de la théorie nécessaire pour décrire correctement l’interaction entre la convection et les pulsations. Nous mettrons en évidence l'apparition de termes importants supplémentaires provenant des écoulements turbulents et nous verrons comment ils peuvent être décrits. De plus, nous présenterons des modèles plus évolués censés reproduire la réalité avec une meilleure fidélité. Finalement, pour illustrer et comparer les différents modèles que nous auront préalablement introduits, nous étudierons un type d'étoiles variables bien connu : les naines blanches ZZ Ceti. Ces étoiles en fin de vie sont connues pour leur enveloppe convective fine mais très importante et surtout pour leur bande d'instabilité pour laquelle de meilleures prédictions sont toujours nécessaires afin de reproduire les observations.


Book
Stark Broadening of Spectral Lines in Plasmas
Author:
ISBN: 3038974560 3038974552 Year: 2019 Publisher: MDPI - Multidisciplinary Digital Publishing Institute

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Abstract

Experimental and theoretical studies of Stark broadening of spectral lines in plasmas are the cornerstone of a large number of spectroscopic diagnostics of laboratory and astrophysical plasmas. As such, they are very important both fundamentally and practically, the latter being due to the numerous practical applications of plasmas. Examples are studies dealing with: controlled thermonuclear fusion (that would provide a virtually unlimited source of energy), plasma-based lasers for medical and other purposes, technological microwave discharges (especially those used for manufacturing microchips), a better understanding of solar activity, other astrophysical objects (white dwarfs, flare stars, and so on). The book reviews advances in this area achieved in recent years and presents new original papers building on these advances.

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