Revisiting the luminosity function of single halo white dwarfs

Autores
Cojocaru, Ruxandra; Torres, Santiago; Althaus, Leandro Gabriel; Isern, Jordi; García Berro, Enrique
Año de publicación
2015
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
White dwarfs are the fossils left by the evolution of low-andintermediate-mass stars, and have very long evolutionary timescales.This allows us to use them to explore the properties of old populations,like the Galactic halo. We present a population synthesis study of theluminosity function of halo white dwarfs, aimed at investigating whichinformation can be derived from the currently available observed data.We employ an up-to-date population synthesis code based on Monte Carlotechniques, that incorporates the most recent and reliable coolingsequences for metal poor progenitors as well as an accurate modeling ofthe observational biases. We find that because the observed sample ofhalo white dwarfs is restricted to the brightest stars only the hotbranch of the white dwarf luminosity function can be used for suchpurposes, and that its shape function is almost insensitive to the mostrelevant inputs, like the adopted cooling sequences, the initial massfunction, the density profile of the stellar spheroid, or the adoptedfraction of unresolved binaries. Moreover, since the cut-off of theobserved luminosity has not been yet determined only lower limits to theage of the halo population can be placed. We conclude that the currentobserved sample of the halo white dwarf population is still too small toobtain definite conclusions about the properties of the stellar halo,and the recently computed white dwarf cooling sequences whichincorporate residual hydrogen burning should be assessed usingmetal-poor globular clusters.
Fil: Cojocaru, Ruxandra. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Fil: Torres, Santiago. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; 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
Fil: Isern, Jordi. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Fil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Materia
White dwarfs
Stellar populations
Abundances
Evolution of galaxies
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:11336/10750
Acceder
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network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Revisiting the luminosity function of single halo white dwarfsCojocaru, RuxandraTorres, SantiagoAlthaus, Leandro GabrielIsern, JordiGarcía Berro, EnriqueWhite dwarfsStellar populationsAbundancesEvolution of galaxieshttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1White dwarfs are the fossils left by the evolution of low-andintermediate-mass stars, and have very long evolutionary timescales.This allows us to use them to explore the properties of old populations,like the Galactic halo. We present a population synthesis study of theluminosity function of halo white dwarfs, aimed at investigating whichinformation can be derived from the currently available observed data.We employ an up-to-date population synthesis code based on Monte Carlotechniques, that incorporates the most recent and reliable coolingsequences for metal poor progenitors as well as an accurate modeling ofthe observational biases. We find that because the observed sample ofhalo white dwarfs is restricted to the brightest stars only the hotbranch of the white dwarf luminosity function can be used for suchpurposes, and that its shape function is almost insensitive to the mostrelevant inputs, like the adopted cooling sequences, the initial massfunction, the density profile of the stellar spheroid, or the adoptedfraction of unresolved binaries. Moreover, since the cut-off of theobserved luminosity has not been yet determined only lower limits to theage of the halo population can be placed. We conclude that the currentobserved sample of the halo white dwarf population is still too small toobtain definite conclusions about the properties of the stellar halo,and the recently computed white dwarf cooling sequences whichincorporate residual hydrogen burning should be assessed usingmetal-poor globular clusters.Fil: Cojocaru, Ruxandra. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; EspañaFil: Torres, Santiago. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; 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; ArgentinaFil: Isern, Jordi. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; EspañaFil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; EspañaEdp Sciences2015-09info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/10750Cojocaru, Ruxandra; Torres, Santiago; Althaus, Leandro Gabriel; Isern, Jordi; García Berro, Enrique; Revisiting the luminosity function of single halo white dwarfs; Edp Sciences; Astronomy And Astrophysics; 9-20150004-6361enginfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201526550info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2015/09/aa26550-15/aa26550-15.htmlinfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T11:07:21Zoai:ri.conicet.gov.ar:11336/10750instacron: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:34982025-10-22 11:07:22.077CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Revisiting the luminosity function of single halo white dwarfs
title Revisiting the luminosity function of single halo white dwarfs
spellingShingle Revisiting the luminosity function of single halo white dwarfs
Cojocaru, Ruxandra
White dwarfs
Stellar populations
Abundances
Evolution of galaxies
title_short Revisiting the luminosity function of single halo white dwarfs
title_full Revisiting the luminosity function of single halo white dwarfs
title_fullStr Revisiting the luminosity function of single halo white dwarfs
title_full_unstemmed Revisiting the luminosity function of single halo white dwarfs
title_sort Revisiting the luminosity function of single halo white dwarfs
dc.creator.none.fl_str_mv Cojocaru, Ruxandra
Torres, Santiago
Althaus, Leandro Gabriel
Isern, Jordi
García Berro, Enrique
author Cojocaru, Ruxandra
author_facet Cojocaru, Ruxandra
Torres, Santiago
Althaus, Leandro Gabriel
Isern, Jordi
García Berro, Enrique
author_role author
author2 Torres, Santiago
Althaus, Leandro Gabriel
Isern, Jordi
García Berro, Enrique
author2_role author
author
author
author
dc.subject.none.fl_str_mv White dwarfs
Stellar populations
Abundances
Evolution of galaxies
topic White dwarfs
Stellar populations
Abundances
Evolution of galaxies
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv White dwarfs are the fossils left by the evolution of low-andintermediate-mass stars, and have very long evolutionary timescales.This allows us to use them to explore the properties of old populations,like the Galactic halo. We present a population synthesis study of theluminosity function of halo white dwarfs, aimed at investigating whichinformation can be derived from the currently available observed data.We employ an up-to-date population synthesis code based on Monte Carlotechniques, that incorporates the most recent and reliable coolingsequences for metal poor progenitors as well as an accurate modeling ofthe observational biases. We find that because the observed sample ofhalo white dwarfs is restricted to the brightest stars only the hotbranch of the white dwarf luminosity function can be used for suchpurposes, and that its shape function is almost insensitive to the mostrelevant inputs, like the adopted cooling sequences, the initial massfunction, the density profile of the stellar spheroid, or the adoptedfraction of unresolved binaries. Moreover, since the cut-off of theobserved luminosity has not been yet determined only lower limits to theage of the halo population can be placed. We conclude that the currentobserved sample of the halo white dwarf population is still too small toobtain definite conclusions about the properties of the stellar halo,and the recently computed white dwarf cooling sequences whichincorporate residual hydrogen burning should be assessed usingmetal-poor globular clusters.
Fil: Cojocaru, Ruxandra. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Fil: Torres, Santiago. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; 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
Fil: Isern, Jordi. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; España
Fil: García Berro, Enrique. Universidad Politecnica de Catalunya; España. Institute for Space Studies of Catalonia; España
description White dwarfs are the fossils left by the evolution of low-andintermediate-mass stars, and have very long evolutionary timescales.This allows us to use them to explore the properties of old populations,like the Galactic halo. We present a population synthesis study of theluminosity function of halo white dwarfs, aimed at investigating whichinformation can be derived from the currently available observed data.We employ an up-to-date population synthesis code based on Monte Carlotechniques, that incorporates the most recent and reliable coolingsequences for metal poor progenitors as well as an accurate modeling ofthe observational biases. We find that because the observed sample ofhalo white dwarfs is restricted to the brightest stars only the hotbranch of the white dwarf luminosity function can be used for suchpurposes, and that its shape function is almost insensitive to the mostrelevant inputs, like the adopted cooling sequences, the initial massfunction, the density profile of the stellar spheroid, or the adoptedfraction of unresolved binaries. Moreover, since the cut-off of theobserved luminosity has not been yet determined only lower limits to theage of the halo population can be placed. We conclude that the currentobserved sample of the halo white dwarf population is still too small toobtain definite conclusions about the properties of the stellar halo,and the recently computed white dwarf cooling sequences whichincorporate residual hydrogen burning should be assessed usingmetal-poor globular clusters.
publishDate 2015
dc.date.none.fl_str_mv 2015-09
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/11336/10750
Cojocaru, Ruxandra; Torres, Santiago; Althaus, Leandro Gabriel; Isern, Jordi; García Berro, Enrique; Revisiting the luminosity function of single halo white dwarfs; Edp Sciences; Astronomy And Astrophysics; 9-2015
0004-6361
url http://hdl.handle.net/11336/10750
identifier_str_mv Cojocaru, Ruxandra; Torres, Santiago; Althaus, Leandro Gabriel; Isern, Jordi; García Berro, Enrique; Revisiting the luminosity function of single halo white dwarfs; Edp Sciences; Astronomy And Astrophysics; 9-2015
0004-6361
dc.language.none.fl_str_mv eng
language eng
dc.relation.none.fl_str_mv info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201526550
info:eu-repo/semantics/altIdentifier/url/http://www.aanda.org/articles/aa/abs/2015/09/aa26550-15/aa26550-15.html
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 12.982451

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