The effects of element diffusion on the pulsational properties of variable DA white dwarf stars

We explore the effects of element diffusion due to gravitational settling and thermal and chemical diffusion on the pulsational properties of DA white dwarfs. To this end, we employ an updated evolutionary code coupled with a pulsational, finite difference code for computing the linear, non-radial g...

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Detalles Bibliográficos
Autores: Córsico, Alejandro Hugo, Benvenuto, Omar Gustavo, Althaus, Leandro Gabriel, Serenelli, Aldo Marcelo
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2002
País:Argentina
Institución:Universidad Nacional de La Plata
Repositorio:SEDICI (UNLP)
Idioma:inglés
OAI Identifier:oai:sedici.unlp.edu.ar:10915/84670
Acceso en línea:http://sedici.unlp.edu.ar/handle/10915/84670
Access Level:acceso abierto
Palabra clave:Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
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spelling The effects of element diffusion on the pulsational properties of variable DA white dwarf starsCórsico, Alejandro HugoBenvenuto, Omar GustavoAlthaus, Leandro GabrielSerenelli, Aldo MarceloCiencias AstronómicasStars: evolutionStars: interiorsStars: oscillationsWhite dwarfsWe explore the effects of element diffusion due to gravitational settling and thermal and chemical diffusion on the pulsational properties of DA white dwarfs. To this end, we employ an updated evolutionary code coupled with a pulsational, finite difference code for computing the linear, non-radial g-modes in the adiabatic approximation. We follow the evolution of a 0.55-M⊙ white dwarf model in a self-consistent way with the evolution of chemical abundance distribution as given by time-dependent diffusion processes. Results are compared with the standard treatment of diffusive equilibrium in the trace element approximation. Appreciable differences are found between the two employed treatments. We conclude that time-dependent element diffusion plays an important role in determining the whole oscillation pattern and the temporal derivative of the periods in DAV white dwarfs. In addition, we discuss the plausibility of the standard description employed in accounting for diffusion in most white dwarf asteroseismological studies.Facultad de Ciencias Astronómicas y Geofísicas2002info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf392-397http://sedici.unlp.edu.ar/handle/10915/84670enginfo:eu-repo/semantics/altIdentifier/issn/0035-8711info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-8711.2002.05311.xinfo:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by-nc-sa/4.0/Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2024-05-08T12:54:16Zoai:sedici.unlp.edu.ar:10915/84670Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292024-05-08 12:54:16.806SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
spellingShingle The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
Córsico, Alejandro Hugo
Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
title_short The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_full The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_fullStr The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_full_unstemmed The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
title_sort The effects of element diffusion on the pulsational properties of variable DA white dwarf stars
dc.creator.none.fl_str_mv Córsico, Alejandro Hugo
Benvenuto, Omar Gustavo
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
author Córsico, Alejandro Hugo
author_facet Córsico, Alejandro Hugo
Benvenuto, Omar Gustavo
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
author_role author
author2 Benvenuto, Omar Gustavo
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
topic Ciencias Astronómicas
Stars: evolution
Stars: interiors
Stars: oscillations
White dwarfs
description We explore the effects of element diffusion due to gravitational settling and thermal and chemical diffusion on the pulsational properties of DA white dwarfs. To this end, we employ an updated evolutionary code coupled with a pulsational, finite difference code for computing the linear, non-radial g-modes in the adiabatic approximation. We follow the evolution of a 0.55-M⊙ white dwarf model in a self-consistent way with the evolution of chemical abundance distribution as given by time-dependent diffusion processes. Results are compared with the standard treatment of diffusive equilibrium in the trace element approximation. Appreciable differences are found between the two employed treatments. We conclude that time-dependent element diffusion plays an important role in determining the whole oscillation pattern and the temporal derivative of the periods in DAV white dwarfs. In addition, we discuss the plausibility of the standard description employed in accounting for diffusion in most white dwarf asteroseismological studies.
publishDate 2002
dc.date.none.fl_str_mv 2002
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
Articulo
http://purl.org/coar/resource_type/c_6501
info:ar-repo/semantics/articulo
format article
status_str publishedVersion
dc.identifier.none.fl_str_mv http://sedici.unlp.edu.ar/handle/10915/84670
url http://sedici.unlp.edu.ar/handle/10915/84670
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0035-8711
info:eu-repo/semantics/altIdentifier/doi/10.1046/j.1365-8711.2002.05311.x
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by-nc-sa/4.0/
Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0)
dc.format.none.fl_str_mv application/pdf
392-397
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
repository.name.fl_str_mv SEDICI (UNLP) - Universidad Nacional de La Plata
repository.mail.fl_str_mv alira@sedici.unlp.edu.ar
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