Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores

We explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooling of massive white dwarf models for both core compositions taking into account the evolutionary history of the progenit...

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Detalhes bibliográficos
Autores: Córsico, Alejandro Hugo, García Berro, E., Althaus, Leandro Gabriel, Isern, J.
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2004
País:Argentina
Recursos:Universidad Nacional de La Plata
Repositório:SEDICI (UNLP)
Idioma:inglês
OAI Identifier:oai:sedici.unlp.edu.ar:10915/84435
Acesso em linha:http://sedici.unlp.edu.ar/handle/10915/84435
Access Level:Acceso aberto
Palavra-chave:Ciencias Astronómicas
Evolution - Stars
Oscillations
Stars
White dwarfs - Stars
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spelling Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon coresCórsico, Alejandro HugoGarcía Berro, E.Althaus, Leandro GabrielIsern, J.Ciencias AstronómicasEvolution - StarsOscillationsStarsWhite dwarfs - StarsWe explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooling of massive white dwarf models for both core compositions taking into account the evolutionary history of the progenitor stars and the chemical evolution caused by time-dependent element diffusion. In particular, for the oxygen/neon models we adopt the chemical profile resulting from repeated carbon-burning shell flashes expected in very massive white dwarf progenitors. For carbon/oxygen white dwarfs we consider the chemical profiles resulting from phase separation upon crystallization. For both compositions we also take into account the effects of crystallization on the oscillation eigenmodes. We find that the pulsational properties of oxygen/neon white dwarfs are noticeably different from those made of carbon/oxygen, thus making asteroseismological techniques a promising way to distinguish between the two types of stars and, hence, to obtain valuable information about their progenitors.Facultad de Ciencias Astronómicas y GeofísicasInstituto de Astrofísica de La Plata2004info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf923-932http://sedici.unlp.edu.ar/handle/10915/84435enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20040416info: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:UNLP2024-05-08T12:54:15Zoai:sedici.unlp.edu.ar:10915/84435Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292024-05-08 12:54:15.537SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
title Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
spellingShingle Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
Córsico, Alejandro Hugo
Ciencias Astronómicas
Evolution - Stars
Oscillations
Stars
White dwarfs - Stars
title_short Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
title_full Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
title_fullStr Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
title_full_unstemmed Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
title_sort Pulsations of massive ZZ Ceti stars with carbon/oxygen and oxygen/neon cores
dc.creator.none.fl_str_mv Córsico, Alejandro Hugo
García Berro, E.
Althaus, Leandro Gabriel
Isern, J.
author Córsico, Alejandro Hugo
author_facet Córsico, Alejandro Hugo
García Berro, E.
Althaus, Leandro Gabriel
Isern, J.
author_role author
author2 García Berro, E.
Althaus, Leandro Gabriel
Isern, J.
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Evolution - Stars
Oscillations
Stars
White dwarfs - Stars
topic Ciencias Astronómicas
Evolution - Stars
Oscillations
Stars
White dwarfs - Stars
description We explore the adiabatic pulsational properties of massive white dwarf stars with hydrogen-rich envelopes and oxygen/neon and carbon/oxygen cores. To this end, we compute the cooling of massive white dwarf models for both core compositions taking into account the evolutionary history of the progenitor stars and the chemical evolution caused by time-dependent element diffusion. In particular, for the oxygen/neon models we adopt the chemical profile resulting from repeated carbon-burning shell flashes expected in very massive white dwarf progenitors. For carbon/oxygen white dwarfs we consider the chemical profiles resulting from phase separation upon crystallization. For both compositions we also take into account the effects of crystallization on the oscillation eigenmodes. We find that the pulsational properties of oxygen/neon white dwarfs are noticeably different from those made of carbon/oxygen, thus making asteroseismological techniques a promising way to distinguish between the two types of stars and, hence, to obtain valuable information about their progenitors.
publishDate 2004
dc.date.none.fl_str_mv 2004
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/10915/84435
url http://sedici.unlp.edu.ar/handle/10915/84435
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/0004-6361
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20040416
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
923-932
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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