New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties

Autores
Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Montgomery, M. H.; García Berro, Enrique; Isern, J.
Año de publicación
2005
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
In view of recent claims that asteroseismology could supply invaluable insight into the crystallization process occurring in the interiors of massive white dwarf stars, we present in this work new pulsational calculations for improved carbon-oxygen DA white dwarf models suitable for the study of massive ZZ Ceti stars. The background models employed in this study, presented in detail in a recent paper by Althaus et al. (2003, A&A, 404, 593), are the result of the complete evolution of massive white dwarf progenitors from the zero-age main sequence through the Asymptotic Giant Branch (AGB) and mass loss phases to the white dwarf regime. Abundance changes are accounted for by means of a full coupling between nuclear evolution and time-dependent mixing due to convection, salt fingers, and diffusive overshoot. In addition, time-dependent element diffusion for multicomponent gases has been considered during the white dwarf evolution. Crystallization and chemical rehomogenization due to phase separation upon crystallization in the core of our models have been fully considered. The effects of crystallization on the period spectrum of these massive white dwarf models are assessed by means of a detailed pulsational analysis of linear, nonradial, adiabatic gravity modes. To properly account for the effects of the presence of a solid phase in the models we impose special conditions on the oscillation eigenfunctions at the solid-liquid interface. We find that the theoretical pulsation spectrum is strongly modified when crystallization is considered, in particular concerning the mode trapping properties of the equilibrium models. We show that the strong mode trapping seen in the models with overshooting can be reproduced by means of a simple analytical model. We also discuss at some length the implications of our study for BPM 37093, the most massive ZZ Ceti star presently known. In particular, we attempt to place constraints on the physical processes occurring prior to the formation of this white dwarf. We find that if BPM 37093 has a stellar mass of ≈1.00 M⊙ its observed spectrum could bear the signature of overshoot episodes during the helium core burning.
Fil: Corsico, Alejandro Hugo. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Althaus, Leandro Gabriel. Universidad Politecnica de Catalunya; España. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Montgomery, M. H.. University of Texas at Austin; Estados Unidos
Fil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluna;
Fil: Isern, J.. Universidad Politecnica de Catalunya; España
Materia
Dense matter
Evolution of stars
White dwarfs
Oscillations
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/39739

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network_name_str CONICET Digital (CONICET)
spelling New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational propertiesCorsico, Alejandro HugoAlthaus, Leandro GabrielMontgomery, M. H.García Berro, EnriqueIsern, J.Dense matterEvolution of starsWhite dwarfsOscillationshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1In view of recent claims that asteroseismology could supply invaluable insight into the crystallization process occurring in the interiors of massive white dwarf stars, we present in this work new pulsational calculations for improved carbon-oxygen DA white dwarf models suitable for the study of massive ZZ Ceti stars. The background models employed in this study, presented in detail in a recent paper by Althaus et al. (2003, A&A, 404, 593), are the result of the complete evolution of massive white dwarf progenitors from the zero-age main sequence through the Asymptotic Giant Branch (AGB) and mass loss phases to the white dwarf regime. Abundance changes are accounted for by means of a full coupling between nuclear evolution and time-dependent mixing due to convection, salt fingers, and diffusive overshoot. In addition, time-dependent element diffusion for multicomponent gases has been considered during the white dwarf evolution. Crystallization and chemical rehomogenization due to phase separation upon crystallization in the core of our models have been fully considered. The effects of crystallization on the period spectrum of these massive white dwarf models are assessed by means of a detailed pulsational analysis of linear, nonradial, adiabatic gravity modes. To properly account for the effects of the presence of a solid phase in the models we impose special conditions on the oscillation eigenfunctions at the solid-liquid interface. We find that the theoretical pulsation spectrum is strongly modified when crystallization is considered, in particular concerning the mode trapping properties of the equilibrium models. We show that the strong mode trapping seen in the models with overshooting can be reproduced by means of a simple analytical model. We also discuss at some length the implications of our study for BPM 37093, the most massive ZZ Ceti star presently known. In particular, we attempt to place constraints on the physical processes occurring prior to the formation of this white dwarf. We find that if BPM 37093 has a stellar mass of ≈1.00 M⊙ its observed spectrum could bear the signature of overshoot episodes during the helium core burning.Fil: Corsico, Alejandro Hugo. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Althaus, Leandro Gabriel. Universidad Politecnica de Catalunya; España. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; ArgentinaFil: Montgomery, M. H.. University of Texas at Austin; Estados UnidosFil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluna;Fil: Isern, J.. Universidad Politecnica de Catalunya; EspañaEDP Sciences2005-01info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/39739Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Montgomery, M. H. ; García Berro, Enrique; Isern, J.; New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties; EDP Sciences; Astronomy and Astrophysics; 429; 1; 1-2005; 277-2900004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20041101info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2005/01/aa1101/aa1101.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:23:41Zoai:ri.conicet.gov.ar:11336/39739instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:23:41.91CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
title New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
spellingShingle New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
Corsico, Alejandro Hugo
Dense matter
Evolution of stars
White dwarfs
Oscillations
title_short New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
title_full New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
title_fullStr New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
title_full_unstemmed New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
title_sort New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
dc.creator.none.fl_str_mv Corsico, Alejandro Hugo
Althaus, Leandro Gabriel
Montgomery, M. H.
García Berro, Enrique
Isern, J.
author Corsico, Alejandro Hugo
author_facet Corsico, Alejandro Hugo
Althaus, Leandro Gabriel
Montgomery, M. H.
García Berro, Enrique
Isern, J.
author_role author
author2 Althaus, Leandro Gabriel
Montgomery, M. H.
García Berro, Enrique
Isern, J.
author2_role author
author
author
author
dc.subject.none.fl_str_mv Dense matter
Evolution of stars
White dwarfs
Oscillations
topic Dense matter
Evolution of stars
White dwarfs
Oscillations
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv In view of recent claims that asteroseismology could supply invaluable insight into the crystallization process occurring in the interiors of massive white dwarf stars, we present in this work new pulsational calculations for improved carbon-oxygen DA white dwarf models suitable for the study of massive ZZ Ceti stars. The background models employed in this study, presented in detail in a recent paper by Althaus et al. (2003, A&A, 404, 593), are the result of the complete evolution of massive white dwarf progenitors from the zero-age main sequence through the Asymptotic Giant Branch (AGB) and mass loss phases to the white dwarf regime. Abundance changes are accounted for by means of a full coupling between nuclear evolution and time-dependent mixing due to convection, salt fingers, and diffusive overshoot. In addition, time-dependent element diffusion for multicomponent gases has been considered during the white dwarf evolution. Crystallization and chemical rehomogenization due to phase separation upon crystallization in the core of our models have been fully considered. The effects of crystallization on the period spectrum of these massive white dwarf models are assessed by means of a detailed pulsational analysis of linear, nonradial, adiabatic gravity modes. To properly account for the effects of the presence of a solid phase in the models we impose special conditions on the oscillation eigenfunctions at the solid-liquid interface. We find that the theoretical pulsation spectrum is strongly modified when crystallization is considered, in particular concerning the mode trapping properties of the equilibrium models. We show that the strong mode trapping seen in the models with overshooting can be reproduced by means of a simple analytical model. We also discuss at some length the implications of our study for BPM 37093, the most massive ZZ Ceti star presently known. In particular, we attempt to place constraints on the physical processes occurring prior to the formation of this white dwarf. We find that if BPM 37093 has a stellar mass of ≈1.00 M⊙ its observed spectrum could bear the signature of overshoot episodes during the helium core burning.
Fil: Corsico, Alejandro Hugo. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Althaus, Leandro Gabriel. Universidad Politecnica de Catalunya; España. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - La Plata. Instituto de Astrofísica La Plata. Universidad Nacional de La Plata. Facultad de Ciencias Astronómicas y Geofísicas. Instituto de Astrofísica La Plata; Argentina
Fil: Montgomery, M. H.. University of Texas at Austin; Estados Unidos
Fil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluna;
Fil: Isern, J.. Universidad Politecnica de Catalunya; España
description In view of recent claims that asteroseismology could supply invaluable insight into the crystallization process occurring in the interiors of massive white dwarf stars, we present in this work new pulsational calculations for improved carbon-oxygen DA white dwarf models suitable for the study of massive ZZ Ceti stars. The background models employed in this study, presented in detail in a recent paper by Althaus et al. (2003, A&A, 404, 593), are the result of the complete evolution of massive white dwarf progenitors from the zero-age main sequence through the Asymptotic Giant Branch (AGB) and mass loss phases to the white dwarf regime. Abundance changes are accounted for by means of a full coupling between nuclear evolution and time-dependent mixing due to convection, salt fingers, and diffusive overshoot. In addition, time-dependent element diffusion for multicomponent gases has been considered during the white dwarf evolution. Crystallization and chemical rehomogenization due to phase separation upon crystallization in the core of our models have been fully considered. The effects of crystallization on the period spectrum of these massive white dwarf models are assessed by means of a detailed pulsational analysis of linear, nonradial, adiabatic gravity modes. To properly account for the effects of the presence of a solid phase in the models we impose special conditions on the oscillation eigenfunctions at the solid-liquid interface. We find that the theoretical pulsation spectrum is strongly modified when crystallization is considered, in particular concerning the mode trapping properties of the equilibrium models. We show that the strong mode trapping seen in the models with overshooting can be reproduced by means of a simple analytical model. We also discuss at some length the implications of our study for BPM 37093, the most massive ZZ Ceti star presently known. In particular, we attempt to place constraints on the physical processes occurring prior to the formation of this white dwarf. We find that if BPM 37093 has a stellar mass of ≈1.00 M⊙ its observed spectrum could bear the signature of overshoot episodes during the helium core burning.
publishDate 2005
dc.date.none.fl_str_mv 2005-01
dc.type.none.fl_str_mv info:eu-repo/semantics/article
info:eu-repo/semantics/publishedVersion
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://hdl.handle.net/11336/39739
Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Montgomery, M. H. ; García Berro, Enrique; Isern, J.; New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties; EDP Sciences; Astronomy and Astrophysics; 429; 1; 1-2005; 277-290
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/39739
identifier_str_mv Corsico, Alejandro Hugo; Althaus, Leandro Gabriel; Montgomery, M. H. ; García Berro, Enrique; Isern, J.; New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties; EDP Sciences; Astronomy and Astrophysics; 429; 1; 1-2005; 277-290
0004-6361
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
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info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2005/01/aa1101/aa1101.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
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dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
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