The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection

We explore the formation and evolution of hydrogen-deficient post-AGB white dwarfs. To this end, we compute the complete evolution of an initially 2.7 M⊙ star from the zero-age main sequence through the thermally pulsing and mass-loss phases to the white dwarf stage. Particular attention is given to...

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Detalles Bibliográficos
Autores principales: Althaus, Leandro Gabriel, Serenelli, Aldo Marcelo, Panei, Jorge Alejandro, Córsico, Alejandro Hugo, García Berro, E., Scóccola, Claudia Graciela
Formato: Articulo
Lenguaje:Inglés
Publicado: 2005
Materias:
Ciencias Astronómicas
Stars: abundances
Stars: AGB stars: interiors
Stars: evolution
Stars: oscillations
Stars: white dwarfs
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/83031
Aporte de:
SEDICI (UNLP) de Universidad Nacional de La Plata
id I19-R120-10915-83031
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: abundances
Stars: AGB stars: interiors
Stars: evolution
Stars: oscillations
Stars: white dwarfs
spellingShingle Ciencias Astronómicas
Stars: abundances
Stars: AGB stars: interiors
Stars: evolution
Stars: oscillations
Stars: white dwarfs
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
Panei, Jorge Alejandro
Córsico, Alejandro Hugo
García Berro, E.
Scóccola, Claudia Graciela
The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection
topic_facet Ciencias Astronómicas
Stars: abundances
Stars: AGB stars: interiors
Stars: evolution
Stars: oscillations
Stars: white dwarfs
description We explore the formation and evolution of hydrogen-deficient post-AGB white dwarfs. To this end, we compute the complete evolution of an initially 2.7 M⊙ star from the zero-age main sequence through the thermally pulsing and mass-loss phases to the white dwarf stage. Particular attention is given to the chemical abundance changes during the whole evolution. A time-dependent scheme for the simultaneous treatment of abundance changes caused by nuclear reactions, diffusive overshooting, salt fingers and convection is considered. We employed the double-diffusive mixing-length theory of convection for fluids with composition gradients. The study can therefore be considered as a test of its performance in low-mass stars. Also, time-dependent element diffusion for multicomponent gases is taken into account during the white dwarf evolution. The evolutionary stages corresponding to the last helium thermal pulse on the early white-dwarf cooling branch and the following born-again episode are carefully explored. Relevant aspects for PG 1159 stars and DB white dwarf evolution are studied in the framework of these new evolutionary models that take into account the history of the white dwarf progenitor. The scope of the calculations is extended to the domain of the helium-rich, carbon-contaminated DQ white dwarfs with the aim of exploring the plausibility of the evolutionary connection PG 1159-DB-DQ. In this regard, the implications for the double-layered chemical structure in pulsating DB white dwarfs is investigated. We examine the consequences of mass-loss episodes during the PG 1159 stage for the chemical stratification of the outer layer of DB and DQ white dwarfs.
format Articulo
Articulo
author Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
Panei, Jorge Alejandro
Córsico, Alejandro Hugo
García Berro, E.
Scóccola, Claudia Graciela
author_facet Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
Panei, Jorge Alejandro
Córsico, Alejandro Hugo
García Berro, E.
Scóccola, Claudia Graciela
author_sort Althaus, Leandro Gabriel
title The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection
title_short The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection
title_full The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection
title_fullStr The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection
title_full_unstemmed The formation and evolution of hydrogen-deficient post-AGB white dwarfs: The emerging chemical profile and the expectations for the PG 1159-DB-DQ evolutionary connection
title_sort formation and evolution of hydrogen-deficient post-agb white dwarfs: the emerging chemical profile and the expectations for the pg 1159-db-dq evolutionary connection
publishDate 2005
url http://sedici.unlp.edu.ar/handle/10915/83031
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