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dc.contributor.author
Corsico, Alejandro Hugo
dc.contributor.author
Althaus, Leandro Gabriel
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Montgomery, M. H.
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García Berro, Enrique
dc.contributor.author
Isern, J.
dc.date.available
2018-03-23T13:59:23Z
dc.date.issued
2005-01
dc.identifier.citation
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
dc.identifier.issn
0004-6361
dc.identifier.uri
http://hdl.handle.net/11336/39739
dc.description.abstract
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.
dc.format
application/pdf
dc.language.iso
eng
dc.publisher
EDP Sciences
dc.rights
info:eu-repo/semantics/openAccess
dc.rights.uri
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.subject
Dense Matter
dc.subject
Evolution of Stars
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White Dwarfs
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Oscillations
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Astronomía
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Ciencias Físicas
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CIENCIAS NATURALES Y EXACTAS
dc.title
New evolutionary models for massive ZZ Ceti stars, II: the effects of crystallization on their pulsational properties
dc.type
info:eu-repo/semantics/article
dc.type
info:ar-repo/semantics/artículo
dc.type
info:eu-repo/semantics/publishedVersion
dc.date.updated
2018-03-06T15:15:03Z
dc.journal.volume
429
dc.journal.number
1
dc.journal.pagination
277-290
dc.journal.pais
Francia
dc.journal.ciudad
Les Ulis, France
dc.description.fil
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
dc.description.fil
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
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Fil: Montgomery, M. H.. University of Texas at Austin; Estados Unidos
dc.description.fil
Fil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluna;
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Fil: Isern, J.. Universidad Politecnica de Catalunya; España
dc.journal.title
Astronomy and Astrophysics
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/doi/http://dx.doi.org/10.1051/0004-6361:20041101
dc.relation.alternativeid
info:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2005/01/aa1101/aa1101.html
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