Fingering convection in accreting hydrogen white dwarf

Autores
Wachlin, Felipe Carlos; Vauclair, S.; Vauclair, G.; Althaus, Leandro Gabriel
Año de publicación
2019
Idioma
inglés
Tipo de recurso
documento de conferencia
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.
Fil: Wachlin, Felipe Carlos. 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: Vauclair, S.. Centre National de la Recherche Scientifique; Francia
Fil: Vauclair, G.. Centre National de la Recherche Scientifique; Francia
Fil: Althaus, Leandro Gabriel. 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
An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements
París
Francia
Institut d'Astrophysique de Paris
Materia
instabilities
stars:evolution
stars:abundances
stars:interiors
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:11336/210918
Acceder
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network_name_str CONICET Digital (CONICET)
spelling Fingering convection in accreting hydrogen white dwarfWachlin, Felipe CarlosVauclair, S.Vauclair, G.Althaus, Leandro Gabrielinstabilitiesstars:evolutionstars:abundancesstars:interiorshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The 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.Fil: Wachlin, Felipe Carlos. 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: Vauclair, S.. Centre National de la Recherche Scientifique; FranciaFil: Vauclair, G.. Centre National de la Recherche Scientifique; FranciaFil: Althaus, Leandro Gabriel. 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; ArgentinaAn International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific AchievementsParísFranciaInstitut d'Astrophysique de ParisEDP Sciences2019info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/conferenceObjectConferenciaJournalhttp://purl.org/coar/resource_type/c_5794info:ar-repo/semantics/documentoDeConferenciaapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/210918Fingering convection in accreting hydrogen white dwarf; An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements; París; Francia; 2016; 1-51633-4760CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.eas-journal.org/articles/eas/abs/2019/01/eas1982018/eas1982018.htmlInternacionalinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:41:07Zoai:ri.conicet.gov.ar:11336/210918instacron: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 09:41:07.771CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Fingering convection in accreting hydrogen white dwarf
title Fingering convection in accreting hydrogen white dwarf
spellingShingle Fingering convection in accreting hydrogen white dwarf
Wachlin, Felipe Carlos
instabilities
stars:evolution
stars:abundances
stars:interiors
title_short Fingering convection in accreting hydrogen white dwarf
title_full Fingering convection in accreting hydrogen white dwarf
title_fullStr Fingering convection in accreting hydrogen white dwarf
title_full_unstemmed Fingering convection in accreting hydrogen white dwarf
title_sort Fingering convection in accreting hydrogen white dwarf
dc.creator.none.fl_str_mv Wachlin, Felipe Carlos
Vauclair, S.
Vauclair, G.
Althaus, Leandro Gabriel
author Wachlin, Felipe Carlos
author_facet Wachlin, Felipe Carlos
Vauclair, S.
Vauclair, G.
Althaus, Leandro Gabriel
author_role author
author2 Vauclair, S.
Vauclair, G.
Althaus, Leandro Gabriel
author2_role author
author
author
dc.subject.none.fl_str_mv instabilities
stars:evolution
stars:abundances
stars:interiors
topic instabilities
stars:evolution
stars:abundances
stars:interiors
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
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.
Fil: Wachlin, Felipe Carlos. 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: Vauclair, S.. Centre National de la Recherche Scientifique; Francia
Fil: Vauclair, G.. Centre National de la Recherche Scientifique; Francia
Fil: Althaus, Leandro Gabriel. 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
An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements
París
Francia
Institut d'Astrophysique de Paris
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
dc.type.none.fl_str_mv info:eu-repo/semantics/publishedVersion
info:eu-repo/semantics/conferenceObject
Conferencia
Journal
http://purl.org/coar/resource_type/c_5794
info:ar-repo/semantics/documentoDeConferencia
status_str publishedVersion
format conferenceObject
dc.identifier.none.fl_str_mv http://hdl.handle.net/11336/210918
Fingering convection in accreting hydrogen white dwarf; An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements; París; Francia; 2016; 1-5
1633-4760
CONICET Digital
CONICET
url http://hdl.handle.net/11336/210918
identifier_str_mv Fingering convection in accreting hydrogen white dwarf; An International Conference in Memory of Professor Jean-Paul Zahn's Great Scientific Achievements; París; Francia; 2016; 1-5
1633-4760
CONICET Digital
CONICET
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/https://www.eas-journal.org/articles/eas/abs/2019/01/eas1982018/eas1982018.html
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
dc.coverage.none.fl_str_mv Internacional
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:CONICET Digital (CONICET)
instname:Consejo Nacional de Investigaciones Científicas y Técnicas
reponame_str CONICET Digital (CONICET)
collection CONICET Digital (CONICET)
instname_str Consejo Nacional de Investigaciones Científicas y Técnicas
repository.name.fl_str_mv CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas
repository.mail.fl_str_mv dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar
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score 13.070432

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