Lithium production in the merging of white dwarf stars

Autores
Longland, Richard; Loren Aguilar, P.; José, Jordi; García Berro, E.; Althaus, Leandro Gabriel
Año de publicación
2012
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
The origin of R Coronae Borealis stars has been elusive for over 200 years. Currently, two theories for their formation have been presented. These are the final flash scenario, in which a dying asymptotic giant branch star throws off its atmosphere to reveal the hydrogen poor, heavily processed material underneath, and the double degenerate scenario, in which two white dwarfs merge to produce a new star with renewed vigour. Some theories predict that the temperatures reached during the latter scenario would destroy any lithium originally present in the white dwarfs. The observed lithium content of some R Coronae Borealis stars, therefore, is often interpreted as an indication that the final flash scenario best describes their formation. In this paper, we show that lithium production can, indeed, occur in the merging of a helium white dwarf with a carbon-oxygen white dwarf if their chemical composition, particularly that of 3He, is fully considered. The production mechanism is described in detail, and the sensitivity of lithium production to the merger environment is investigated. Nucleosynthesis post-processing calculations of smoothed-particle hydrodynamics (SPH) tracer particles are performed to show that any lithium produced in these environments will be concentrated towards the cloud of material surrounding the R CrB star. Measurements of the lithium content of these clouds would, therefore, provide a valuable insight into the formation mechanism of R CrB stars.
Fil: Longland, Richard. Institut d’Estudis Espacials de Catalunya; España
Fil: Loren Aguilar, P.. Institut d’Estudis Espacials de Catalunya; España. Universidad Politecnica de Catalunya; España
Fil: José, Jordi. Universitat Oberta de Catalunya; España. Institut d’Estudis Espacials de Catalunya; España
Fil: García Berro, E.. Universidad Politecnica de Catalunya; España. Institut d’Estudis Espacials de Catalunya; España
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
Materia
Nuclear reactions
Abundances
White dwarfs stars
AGB and post-AGB
Evolution of stars
Nucleosynthesis
Nivel de accesibilidad
acceso abierto
Condiciones de uso
https://creativecommons.org/licenses/by/2.5/ar/
Repositorio
CONICET Digital (CONICET)
Institución
Consejo Nacional de Investigaciones Científicas y Técnicas
OAI Identificador
oai:ri.conicet.gov.ar:11336/8291
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/8291
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Lithium production in the merging of white dwarf starsLongland, RichardLoren Aguilar, P.José, JordiGarcía Berro, E.Althaus, Leandro GabrielNuclear reactionsAbundancesWhite dwarfs starsAGB and post-AGBEvolution of starsNucleosynthesishttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1The origin of R Coronae Borealis stars has been elusive for over 200 years. Currently, two theories for their formation have been presented. These are the final flash scenario, in which a dying asymptotic giant branch star throws off its atmosphere to reveal the hydrogen poor, heavily processed material underneath, and the double degenerate scenario, in which two white dwarfs merge to produce a new star with renewed vigour. Some theories predict that the temperatures reached during the latter scenario would destroy any lithium originally present in the white dwarfs. The observed lithium content of some R Coronae Borealis stars, therefore, is often interpreted as an indication that the final flash scenario best describes their formation. In this paper, we show that lithium production can, indeed, occur in the merging of a helium white dwarf with a carbon-oxygen white dwarf if their chemical composition, particularly that of 3He, is fully considered. The production mechanism is described in detail, and the sensitivity of lithium production to the merger environment is investigated. Nucleosynthesis post-processing calculations of smoothed-particle hydrodynamics (SPH) tracer particles are performed to show that any lithium produced in these environments will be concentrated towards the cloud of material surrounding the R CrB star. Measurements of the lithium content of these clouds would, therefore, provide a valuable insight into the formation mechanism of R CrB stars.Fil: Longland, Richard. Institut d’Estudis Espacials de Catalunya; EspañaFil: Loren Aguilar, P.. Institut d’Estudis Espacials de Catalunya; España. Universidad Politecnica de Catalunya; EspañaFil: José, Jordi. Universitat Oberta de Catalunya; España. Institut d’Estudis Espacials de Catalunya; EspañaFil: García Berro, E.. Universidad Politecnica de Catalunya; España. Institut d’Estudis Espacials de Catalunya; EspañaFil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; ArgentinaEdp Sciences2012-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/8291Longland, Richard; Loren Aguilar, P.; José, Jordi; García Berro, E.; Althaus, Leandro Gabriel; Lithium production in the merging of white dwarf stars; Edp Sciences; Astronomy And Astrophysics; 542; A117; 6-2012; 117-1230004-6361enginfo:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2012/06/aa19289-12/aa19289-12.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201219289info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1205.2538v1info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T09:33:50Zoai:ri.conicet.gov.ar:11336/8291instacron: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 09:33:51.077CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Lithium production in the merging of white dwarf stars
title Lithium production in the merging of white dwarf stars
spellingShingle Lithium production in the merging of white dwarf stars
Longland, Richard
Nuclear reactions
Abundances
White dwarfs stars
AGB and post-AGB
Evolution of stars
Nucleosynthesis
title_short Lithium production in the merging of white dwarf stars
title_full Lithium production in the merging of white dwarf stars
title_fullStr Lithium production in the merging of white dwarf stars
title_full_unstemmed Lithium production in the merging of white dwarf stars
title_sort Lithium production in the merging of white dwarf stars
dc.creator.none.fl_str_mv Longland, Richard
Loren Aguilar, P.
José, Jordi
García Berro, E.
Althaus, Leandro Gabriel
author Longland, Richard
author_facet Longland, Richard
Loren Aguilar, P.
José, Jordi
García Berro, E.
Althaus, Leandro Gabriel
author_role author
author2 Loren Aguilar, P.
José, Jordi
García Berro, E.
Althaus, Leandro Gabriel
author2_role author
author
author
author
dc.subject.none.fl_str_mv Nuclear reactions
Abundances
White dwarfs stars
AGB and post-AGB
Evolution of stars
Nucleosynthesis
topic Nuclear reactions
Abundances
White dwarfs stars
AGB and post-AGB
Evolution of stars
Nucleosynthesis
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 origin of R Coronae Borealis stars has been elusive for over 200 years. Currently, two theories for their formation have been presented. These are the final flash scenario, in which a dying asymptotic giant branch star throws off its atmosphere to reveal the hydrogen poor, heavily processed material underneath, and the double degenerate scenario, in which two white dwarfs merge to produce a new star with renewed vigour. Some theories predict that the temperatures reached during the latter scenario would destroy any lithium originally present in the white dwarfs. The observed lithium content of some R Coronae Borealis stars, therefore, is often interpreted as an indication that the final flash scenario best describes their formation. In this paper, we show that lithium production can, indeed, occur in the merging of a helium white dwarf with a carbon-oxygen white dwarf if their chemical composition, particularly that of 3He, is fully considered. The production mechanism is described in detail, and the sensitivity of lithium production to the merger environment is investigated. Nucleosynthesis post-processing calculations of smoothed-particle hydrodynamics (SPH) tracer particles are performed to show that any lithium produced in these environments will be concentrated towards the cloud of material surrounding the R CrB star. Measurements of the lithium content of these clouds would, therefore, provide a valuable insight into the formation mechanism of R CrB stars.
Fil: Longland, Richard. Institut d’Estudis Espacials de Catalunya; España
Fil: Loren Aguilar, P.. Institut d’Estudis Espacials de Catalunya; España. Universidad Politecnica de Catalunya; España
Fil: José, Jordi. Universitat Oberta de Catalunya; España. Institut d’Estudis Espacials de Catalunya; España
Fil: García Berro, E.. Universidad Politecnica de Catalunya; España. Institut d’Estudis Espacials de Catalunya; España
Fil: Althaus, Leandro Gabriel. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Instituto de Astrofísica de La Plata; Argentina. Universidad Nacional de la Plata. Facultad de Ciencias Astronómicas y Geofísicas; Argentina
description The origin of R Coronae Borealis stars has been elusive for over 200 years. Currently, two theories for their formation have been presented. These are the final flash scenario, in which a dying asymptotic giant branch star throws off its atmosphere to reveal the hydrogen poor, heavily processed material underneath, and the double degenerate scenario, in which two white dwarfs merge to produce a new star with renewed vigour. Some theories predict that the temperatures reached during the latter scenario would destroy any lithium originally present in the white dwarfs. The observed lithium content of some R Coronae Borealis stars, therefore, is often interpreted as an indication that the final flash scenario best describes their formation. In this paper, we show that lithium production can, indeed, occur in the merging of a helium white dwarf with a carbon-oxygen white dwarf if their chemical composition, particularly that of 3He, is fully considered. The production mechanism is described in detail, and the sensitivity of lithium production to the merger environment is investigated. Nucleosynthesis post-processing calculations of smoothed-particle hydrodynamics (SPH) tracer particles are performed to show that any lithium produced in these environments will be concentrated towards the cloud of material surrounding the R CrB star. Measurements of the lithium content of these clouds would, therefore, provide a valuable insight into the formation mechanism of R CrB stars.
publishDate 2012
dc.date.none.fl_str_mv 2012-06
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/11336/8291
Longland, Richard; Loren Aguilar, P.; José, Jordi; García Berro, E.; Althaus, Leandro Gabriel; Lithium production in the merging of white dwarf stars; Edp Sciences; Astronomy And Astrophysics; 542; A117; 6-2012; 117-123
0004-6361
url http://hdl.handle.net/11336/8291
identifier_str_mv Longland, Richard; Loren Aguilar, P.; José, Jordi; García Berro, E.; Althaus, Leandro Gabriel; Lithium production in the merging of white dwarf stars; Edp Sciences; Astronomy And Astrophysics; 542; A117; 6-2012; 117-123
0004-6361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2012/06/aa19289-12/aa19289-12.html
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201219289
info:eu-repo/semantics/altIdentifier/url/https://arxiv.org/abs/1205.2538v1
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
https://creativecommons.org/licenses/by/2.5/ar/
eu_rights_str_mv openAccess
rights_invalid_str_mv https://creativecommons.org/licenses/by/2.5/ar/
dc.format.none.fl_str_mv application/pdf
application/pdf
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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