DQ white-dwarf stars with low C abundance: Possible progenitors

Autores
Scóccola, Claudia Graciela; Althaus, Leandro Gabriel; Serenelli, Aldo Marcelo; Rohrmann, René; Córsico, Alejandro Hugo
Año de publicación
2006
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Aims. The present paper focuses on the evolution of hydrogen-deficient white dwarfs with the aim of exploring the consequences of different initial envelope structures on the carbon abundances expected in helium-rich, carbon-contaminated DQ white dwarfs. In particular, the evolutionary link between the DQs with low detected carbon abundances and the PG 1159, extreme horizontal branch, and helium-rich R Coronae Borealis (RCrB) stars is explored. Methods. We present full evolutionary calculations that take a self-consistent treatment of element diffusion into account as well as expectations for the outer layer chemical stratification of progenitor stars upon entering the white dwarf regime. Results. We find that PG 1159 stars cannot be related to any DQ white dwarfs with low C abundances. Instead, we suggest that the latter could constitute the progeny of the giant, helium-rich RCrB stars.
Facultad de Ciencias Astronómicas y Geofísicas
Materia
Ciencias Astronómicas
Stars: abundances
Stars: evolution
Stars: interiors
Stars: white dwarfs
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by-nc-sa/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/83352

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oai_identifier_str oai:sedici.unlp.edu.ar:10915/83352
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling DQ white-dwarf stars with low C abundance: Possible progenitorsScóccola, Claudia GracielaAlthaus, Leandro GabrielSerenelli, Aldo MarceloRohrmann, RenéCórsico, Alejandro HugoCiencias AstronómicasStars: abundancesStars: evolutionStars: interiorsStars: white dwarfs<b>Aims.</b> The present paper focuses on the evolution of hydrogen-deficient white dwarfs with the aim of exploring the consequences of different initial envelope structures on the carbon abundances expected in helium-rich, carbon-contaminated DQ white dwarfs. In particular, the evolutionary link between the DQs with low detected carbon abundances and the PG 1159, extreme horizontal branch, and helium-rich R Coronae Borealis (RCrB) stars is explored. <b>Methods.</b> We present full evolutionary calculations that take a self-consistent treatment of element diffusion into account as well as expectations for the outer layer chemical stratification of progenitor stars upon entering the white dwarf regime. <b>Results.</b> We find that PG 1159 stars cannot be related to any DQ white dwarfs with low C abundances. Instead, we suggest that the latter could constitute the progeny of the giant, helium-rich RCrB stars.Facultad de Ciencias Astronómicas y Geofísicas2006info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf147-155http://sedici.unlp.edu.ar/handle/10915/83352enginfo:eu-repo/semantics/altIdentifier/issn/0004-6361info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361:20053769info: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:UNLP2025-09-29T11:15:45Zoai:sedici.unlp.edu.ar:10915/83352Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-09-29 11:15:46.122SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv DQ white-dwarf stars with low C abundance: Possible progenitors
title DQ white-dwarf stars with low C abundance: Possible progenitors
spellingShingle DQ white-dwarf stars with low C abundance: Possible progenitors
Scóccola, Claudia Graciela
Ciencias Astronómicas
Stars: abundances
Stars: evolution
Stars: interiors
Stars: white dwarfs
title_short DQ white-dwarf stars with low C abundance: Possible progenitors
title_full DQ white-dwarf stars with low C abundance: Possible progenitors
title_fullStr DQ white-dwarf stars with low C abundance: Possible progenitors
title_full_unstemmed DQ white-dwarf stars with low C abundance: Possible progenitors
title_sort DQ white-dwarf stars with low C abundance: Possible progenitors
dc.creator.none.fl_str_mv Scóccola, Claudia Graciela
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
Rohrmann, René
Córsico, Alejandro Hugo
author Scóccola, Claudia Graciela
author_facet Scóccola, Claudia Graciela
Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
Rohrmann, René
Córsico, Alejandro Hugo
author_role author
author2 Althaus, Leandro Gabriel
Serenelli, Aldo Marcelo
Rohrmann, René
Córsico, Alejandro Hugo
author2_role author
author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Stars: abundances
Stars: evolution
Stars: interiors
Stars: white dwarfs
topic Ciencias Astronómicas
Stars: abundances
Stars: evolution
Stars: interiors
Stars: white dwarfs
dc.description.none.fl_txt_mv <b>Aims.</b> The present paper focuses on the evolution of hydrogen-deficient white dwarfs with the aim of exploring the consequences of different initial envelope structures on the carbon abundances expected in helium-rich, carbon-contaminated DQ white dwarfs. In particular, the evolutionary link between the DQs with low detected carbon abundances and the PG 1159, extreme horizontal branch, and helium-rich R Coronae Borealis (RCrB) stars is explored. <b>Methods.</b> We present full evolutionary calculations that take a self-consistent treatment of element diffusion into account as well as expectations for the outer layer chemical stratification of progenitor stars upon entering the white dwarf regime. <b>Results.</b> We find that PG 1159 stars cannot be related to any DQ white dwarfs with low C abundances. Instead, we suggest that the latter could constitute the progeny of the giant, helium-rich RCrB stars.
Facultad de Ciencias Astronómicas y Geofísicas
description <b>Aims.</b> The present paper focuses on the evolution of hydrogen-deficient white dwarfs with the aim of exploring the consequences of different initial envelope structures on the carbon abundances expected in helium-rich, carbon-contaminated DQ white dwarfs. In particular, the evolutionary link between the DQs with low detected carbon abundances and the PG 1159, extreme horizontal branch, and helium-rich R Coronae Borealis (RCrB) stars is explored. <b>Methods.</b> We present full evolutionary calculations that take a self-consistent treatment of element diffusion into account as well as expectations for the outer layer chemical stratification of progenitor stars upon entering the white dwarf regime. <b>Results.</b> We find that PG 1159 stars cannot be related to any DQ white dwarfs with low C abundances. Instead, we suggest that the latter could constitute the progeny of the giant, helium-rich RCrB stars.
publishDate 2006
dc.date.none.fl_str_mv 2006
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/10915/83352
url http://sedici.unlp.edu.ar/handle/10915/83352
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/10.1051/0004-6361:20053769
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
147-155
dc.source.none.fl_str_mv reponame:SEDICI (UNLP)
instname:Universidad Nacional de La Plata
instacron:UNLP
reponame_str SEDICI (UNLP)
collection SEDICI (UNLP)
instname_str Universidad Nacional de La Plata
instacron_str UNLP
institution 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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