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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.
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52 <063> --- Matter --- -Neutron stars --- -Stars --- -White dwarfs --- Compact objects (Astronomy) --- Dwarf stars --- Sidereal system --- Galaxies --- Circumstellar matter --- Stars --- Pulsars --- Atoms --- Dynamics --- Gravitation --- Physics --- Substance (Philosophy) --- Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- Congresses --- Evolution --- -Congresses --- Neutron stars --- White dwarf stars --- -Astronomie. Astrofysica. Ruimteonderzoek. Geodesie--Congressen --- White dwarfs
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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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The emphasis on white dwarf stars and cosmology arises from the most recent advances in cosmological and galactic structure research in which white dwarf stars are playing a very prominent role. Examples are Type Ia supernovae (i.e. white dwarf supernovae), the origin and evolution of the universe, the age of the galactic disk, cosmochronology using white dwarfs in globular clusters and galactic clusters, and the physics of accretion onto compact (very dense) stars. As an assisting guide to the reader, we have included, by invitation, comprehensive review articles in each of the four major areas of the book, white dwarf supernovae, cosmology, accretion physics and galactic structure. The reviews include introductory material that they build upon. The book is suitable and most useful to advanced undergraduates, graduate students and scientific professionals (e.g. astronomers, astrophysicists, cosmologists, physicists).
White dwarf stars --- Dwarf stars --- Low-luminosity stars --- Stars --- White dwarfs --- Compact objects (Astronomy) --- Astronomy. --- Astronomy, Astrophysics and Cosmology. --- Astronomy, Observations and Techniques. --- Astrophysics. --- Observations, Astronomical. --- Astronomy—Observations. --- Astronomical observations --- Observations, Astronomical --- Astronomical physics --- Astronomy --- Cosmic physics --- Physics --- Cosmological probes --- Galactic probes
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This thesis presents a study of the origin of an apparently extended X-ray emission associated with the Galactic ridge. The study was carried out with broadband spectra obtained from mapping observations in the Galactic bulge region conducted in 2005–2010 by the Suzaku space X-ray observatory. The spectra were analyzed with a newly constructed X-ray spectral model of an accreting white dwarf binary that is one of the proposed candidate stars for the origin of the Galactic ridge emission in the higher energy band. Fitting of the observed Galactic ridge spectra with the model showed that there is another spectral component that fills the gap between the observed X-ray flux and the component expected from the accreting white dwarf spectral model in the lower energy band. This additional soft spectral component was nicely explained by an X-ray spectral model of normal stars. The result, together with previously reported high-resolution imaging results, strongly supports the idea that the Galactic ridge X-ray emission is an assembly of dim, discrete X-ray point sources.
Astronomy -- Congresses. --- Pulsars. --- X-ray astronomy --- White dwarf stars --- X-ray sources, Galactic --- Astronomy & Astrophysics --- Physical Sciences & Mathematics --- Astronomy - General --- Astrophysics --- White dwarf stars. --- X-ray astronomy. --- White dwarfs --- Physics. --- Observations, Astronomical. --- Astronomy --- Physical measurements. --- Measurement. --- Astronomy, Observations and Techniques. --- Measurement Science and Instrumentation. --- Observations. --- Space astronomy --- X-rays --- Compact objects (Astronomy) --- Dwarf stars --- Astronomy—Observations. --- Measurement . --- Measuring --- Mensuration --- Mathematics --- Technology --- Metrology --- Physical measurements --- Measurements, Physical --- Mathematical physics --- Measurement --- Astronomical observations --- Observations, Astronomical --- Suzaku Mission (Japan)
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Special and General Relativity are concisely developed together with essential aspects of nuclear and particle physics. Problem sets are provided for many chapters, making the book ideal for a course on the physics of white dwarf and neutron star interiors.
General relativity (Physics) --- Special relativity (Physics) --- White dwarf stars. --- Neutron stars. --- Black holes (Astronomy) --- Relativité générale (Physique) --- Relativité restreinte (Physique) --- Naines blanches --- Etoiles à neutrons --- Trous noirs (Astronomie) --- White dwarf stars --- Neutron stars --- Atomic Physics --- Astrophysics --- Physics --- Astronomy & Astrophysics --- Physical Sciences & Mathematics --- Relativité générale (Physique) --- Relativité restreinte (Physique) --- Etoiles à neutrons --- EPUB-LIV-FT LIVPHYSI SPRINGER-B --- White dwarfs --- Ether drift --- Mass energy relations --- Relativity theory, Special --- Restricted theory of relativity --- Special theory of relativity --- Relativistic theory of gravitation --- Relativity theory, General --- Frozen stars --- Physics. --- Gravitation. --- Astronomy. --- Astrophysics. --- Cosmology. --- Classical and Quantum Gravitation, Relativity Theory. --- Astrophysics and Astroparticles. --- Astronomy, Astrophysics and Cosmology. --- Compact objects (Astronomy) --- Gravitational collapse --- Stars --- Pulsars --- Dwarf stars --- Relativity (Physics) --- Gravitation --- Astronomical physics --- Astronomy --- Cosmic physics --- Field theory (Physics) --- Matter --- Antigravity --- Centrifugal force --- Properties
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