Fingering convection in accreting hydrogen white dwarfs

Autores
Wachlin, Felipe Carlos; Vauclair, Sylvie; Vauclair, G.; Althaus, Leandro Gabriel
Año de publicación
2019
Idioma
español castellano
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper in the star than by considering only mixing in the surface dynamical convection zone, in a time scale much shorter than that of gravitational settling. We performed numerical simulations of a continuous accretion of heavy material having a bulk Earth composition on the two well studied DAZ and ZZ Ceti pulsators GD 133 and G 29-38. We find that the existence of fingering convection implies much larger accretion rates to explain the observed abundances than previous estimates based on the standard mixing length theory and gravitational settling only.
Instituto de Astrofísica de La Plata
Materia
Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
Nivel de accesibilidad
acceso abierto
Condiciones de uso
http://creativecommons.org/licenses/by/4.0/
Repositorio
SEDICI (UNLP)
Institución
Universidad Nacional de La Plata
OAI Identificador
oai:sedici.unlp.edu.ar:10915/123832
Acceder
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oai_identifier_str oai:sedici.unlp.edu.ar:10915/123832
network_acronym_str SEDICI
repository_id_str 1329
network_name_str SEDICI (UNLP)
spelling Fingering convection in accreting hydrogen white dwarfsWachlin, Felipe CarlosVauclair, SylvieVauclair, G.Althaus, Leandro GabrielCiencias AstronómicasFísicaWhite dwarfsStandard mixing length theoryThermohaline convectionThe accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper in the star than by considering only mixing in the surface dynamical convection zone, in a time scale much shorter than that of gravitational settling. We performed numerical simulations of a continuous accretion of heavy material having a bulk Earth composition on the two well studied DAZ and ZZ Ceti pulsators GD 133 and G 29-38. We find that the existence of fingering convection implies much larger accretion rates to explain the observed abundances than previous estimates based on the standard mixing length theory and gravitational settling only.Instituto de Astrofísica de La Plata2019-06-21info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionArticulohttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdf183-187http://sedici.unlp.edu.ar/handle/10915/123832spainfo:eu-repo/semantics/altIdentifier/issn/1633-4760info:eu-repo/semantics/altIdentifier/issn/1638-1963info:eu-repo/semantics/altIdentifier/doi/10.1051/eas/1982018info:eu-repo/semantics/openAccesshttp://creativecommons.org/licenses/by/4.0/Creative Commons Attribution 4.0 International (CC BY 4.0)reponame:SEDICI (UNLP)instname:Universidad Nacional de La Platainstacron:UNLP2025-10-22T17:10:19Zoai:sedici.unlp.edu.ar:10915/123832Institucionalhttp://sedici.unlp.edu.ar/Universidad públicaNo correspondehttp://sedici.unlp.edu.ar/oai/snrdalira@sedici.unlp.edu.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:13292025-10-22 17:10:19.525SEDICI (UNLP) - Universidad Nacional de La Platafalse
dc.title.none.fl_str_mv Fingering convection in accreting hydrogen white dwarfs
title Fingering convection in accreting hydrogen white dwarfs
spellingShingle Fingering convection in accreting hydrogen white dwarfs
Wachlin, Felipe Carlos
Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
title_short Fingering convection in accreting hydrogen white dwarfs
title_full Fingering convection in accreting hydrogen white dwarfs
title_fullStr Fingering convection in accreting hydrogen white dwarfs
title_full_unstemmed Fingering convection in accreting hydrogen white dwarfs
title_sort Fingering convection in accreting hydrogen white dwarfs
dc.creator.none.fl_str_mv Wachlin, Felipe Carlos
Vauclair, Sylvie
Vauclair, G.
Althaus, Leandro Gabriel
author Wachlin, Felipe Carlos
author_facet Wachlin, Felipe Carlos
Vauclair, Sylvie
Vauclair, G.
Althaus, Leandro Gabriel
author_role author
author2 Vauclair, Sylvie
Vauclair, G.
Althaus, Leandro Gabriel
author2_role author
author
author
dc.subject.none.fl_str_mv Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
topic Ciencias Astronómicas
Física
White dwarfs
Standard mixing length theory
Thermohaline convection
dc.description.none.fl_txt_mv The accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper in the star than by considering only mixing in the surface dynamical convection zone, in a time scale much shorter than that of gravitational settling. We performed numerical simulations of a continuous accretion of heavy material having a bulk Earth composition on the two well studied DAZ and ZZ Ceti pulsators GD 133 and G 29-38. We find that the existence of fingering convection implies much larger accretion rates to explain the observed abundances than previous estimates based on the standard mixing length theory and gravitational settling only.
Instituto de Astrofísica de La Plata
description The accretion of heavy material from debris disk on the surface of hydrogen-rich white dwarfs induces a double diffusivity instability known as the fingering convection. It leads to an efficient extra mixing which brings the accreted material deeper in the star than by considering only mixing in the surface dynamical convection zone, in a time scale much shorter than that of gravitational settling. We performed numerical simulations of a continuous accretion of heavy material having a bulk Earth composition on the two well studied DAZ and ZZ Ceti pulsators GD 133 and G 29-38. We find that the existence of fingering convection implies much larger accretion rates to explain the observed abundances than previous estimates based on the standard mixing length theory and gravitational settling only.
publishDate 2019
dc.date.none.fl_str_mv 2019-06-21
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/10915/123832
url http://sedici.unlp.edu.ar/handle/10915/123832
dc.language.none.fl_str_mv spa
language spa
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/issn/1633-4760
info:eu-repo/semantics/altIdentifier/issn/1638-1963
info:eu-repo/semantics/altIdentifier/doi/10.1051/eas/1982018
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
eu_rights_str_mv openAccess
rights_invalid_str_mv http://creativecommons.org/licenses/by/4.0/
Creative Commons Attribution 4.0 International (CC BY 4.0)
dc.format.none.fl_str_mv application/pdf
183-187
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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score 12.982451

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