Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution

The present work is designed to explore the evolutionary and pulsational properties of low-mass white dwarfs with carbon/oxygen cores. In particular, we follow the evolution of a 0.33-M⊙ white dwarf remnant in a self-consistent way with the predictions of nuclear burning, element diffusion and the h...

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Autores principales: Althaus, Leandro Gabriel, Córsico, Alejandro Hugo, Gautschy, A., Han, Z., Serenelli, Aldo Marcelo, Panei, Jorge Alejandro
Formato: Articulo
Lenguaje:Inglés
Publicado: 2004
Materias:
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84476
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id I19-R120-10915-84476
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
Binaries: general
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
spellingShingle Ciencias Astronómicas
Binaries: general
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Gautschy, A.
Han, Z.
Serenelli, Aldo Marcelo
Panei, Jorge Alejandro
Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
topic_facet Ciencias Astronómicas
Binaries: general
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
description The present work is designed to explore the evolutionary and pulsational properties of low-mass white dwarfs with carbon/oxygen cores. In particular, we follow the evolution of a 0.33-M⊙ white dwarf remnant in a self-consistent way with the predictions of nuclear burning, element diffusion and the history of the white dwarf progenitor. Attention is focused on the occurrence of hydrogen shell flashes induced by diffusion processes during cooling phases. The evolutionary stages prior to the white dwarf formation are also fully accounted for by computing the conservative binary evolution of an initially 2.5-M⊙ Population I star with a 1.25-M ⊙ companion, and with period P<SUB>i</SUB> = 3d. Evolution is followed down to the domain of the ZZ Ceti stars on the white dwarf cooling branch. We find that chemical diffusion induces the occurrence of an additional hydrogen thermonuclear flash, which leads to stellar models with thin hydrogen envelopes. As a result, a fast cooling is encountered at advanced stages of evolution. In addition, we explore the adiabatic pulsational properties of the resulting white dwarf models. As compared with their helium-core counterparts, low-mass oxygen-core white dwarfs are characterized by a pulsational spectrum much more featured, an aspect which could eventually be used for distinguishing both types of stars, if low-mass white dwarfs were in fact found to pulsate as ZZ Ceti-type variables. Finally, we perform a non-adiabatic pulsational analysis on the resulting carbon/oxygen low-mass white dwarf models.
format Articulo
Articulo
author Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Gautschy, A.
Han, Z.
Serenelli, Aldo Marcelo
Panei, Jorge Alejandro
author_facet Althaus, Leandro Gabriel
Córsico, Alejandro Hugo
Gautschy, A.
Han, Z.
Serenelli, Aldo Marcelo
Panei, Jorge Alejandro
author_sort Althaus, Leandro Gabriel
title Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
title_short Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
title_full Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
title_fullStr Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
title_full_unstemmed Evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
title_sort evolutionary and pulsational properties of low-mass white dwarf stars with oxygen cores resulting from close binary evolution
publishDate 2004
url http://sedici.unlp.edu.ar/handle/10915/84476
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