Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion

The purpose of this paper is to present new full evolutionary calculations for DA white dwarf stars with the major aim of providing a physically sound reference frame for exploring the pulsation properties of the resulting models in future communications. Here, white dwarf evolution is followed in a...

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Detalles Bibliográficos
Autores principales:	Althaus, Leandro Gabriel, Serenelli, Aldo Marcelo, Córsico, Alejandro Hugo, Benvenuto, Omar Gustavo
Formato:	Articulo
Lenguaje:	Inglés
Publicado:	2002
Materias:	Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs
Acceso en línea:	http://sedici.unlp.edu.ar/handle/10915/84586
Aporte de:	SEDICI (UNLP) de Universidad Nacional de La Plata

id	I19-R120-10915-84586
record_format	dspace
institution	Universidad Nacional de La Plata
institution_str	I-19
repository_str	R-120
collection	SEDICI (UNLP)
language	Inglés
topic	Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs
spellingShingle	Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs Althaus, Leandro Gabriel Serenelli, Aldo Marcelo Córsico, Alejandro Hugo Benvenuto, Omar Gustavo Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
topic_facet	Ciencias Astronómicas Stars: evolution Stars: interiors Stars: oscillations White dwarfs
description	The purpose of this paper is to present new full evolutionary calculations for DA white dwarf stars with the major aim of providing a physically sound reference frame for exploring the pulsation properties of the resulting models in future communications. Here, white dwarf evolution is followed in a self-consistent way with the predictions of time-dependent element diffusion and nuclear burning. In addition, full account is taken of the evolutionary stages prior to white dwarf formation. In particular, we follow the evolution of a 3-M⊙ model from the zero-age main sequence (the adopted metallicity is Z = 0.02), all the way from the stages of hydrogen and helium burning in the core up to the thermally pulsing phase. After experiencing 11 thermal pulses, the model is forced to evolve towards its white dwarf configuration by invoking strong mass loss episodes. Further evolution is followed down to the domain of the ZZ Ceti stars on the white dwarf cooling branch. Emphasis is placed on the evolution of the chemical abundance distribution caused by diffusion processes and the role played by hydrogen burning during the white dwarf evolution. We find that discontinuities in the abundance distribution at the start of the cooling branch are considerably smoothed out by diffusion processes by the time the ZZ Ceti domain is reached. Nuclear burning during the white dwarf stage does not represent a major source of energy, as expected for a progenitor star of initially high metallicity. We also find that thermal diffusion lessens even further the importance of nuclear burning. Furthermore, the implications of our evolutionary models for the main quantities relevant for adiabatic pulsation analysis are discussed. Interestingly, the shape of the Ledoux term is markedly smoother compared with previous detailed studies of white dwarfs. This is translated into a different behaviour of the Brunt-Väisälä frequency.
format	Articulo Articulo
author	Althaus, Leandro Gabriel Serenelli, Aldo Marcelo Córsico, Alejandro Hugo Benvenuto, Omar Gustavo
author_facet	Althaus, Leandro Gabriel Serenelli, Aldo Marcelo Córsico, Alejandro Hugo Benvenuto, Omar Gustavo
author_sort	Althaus, Leandro Gabriel
title	Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
title_short	Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
title_full	Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
title_fullStr	Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
title_full_unstemmed	Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion
title_sort	evolution of a 3-m⊙ star from the main sequence to the zz ceti stage: the role played by element diffusion
publishDate	2002
url	http://sedici.unlp.edu.ar/handle/10915/84586
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bdutipo_str	Repositorios
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Evolution of a 3-M⊙ star from the main sequence to the ZZ Ceti stage: the role played by element diffusion

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