Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function

Autores
Tononi, Jordi; Torres, Santiago; García Berro, Enrique; Camisassa, María Eugenia; Althaus, Leandro Gabriel; Rebassa Mansergas, Alberto
Año de publicación
2019
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Aims: We analyzed the effect of the sedimentation of 22Ne on the local white dwarf luminosity function by studying scenarios under different Galactic metallicity models. Methods: We use an advanced population synthesis code based on Monte Carlo techniques to derive the synthetic luminosity function. The code incorporates the most recent and reliable cooling sequences and an accurate modeling of the observational biases under different scenarios. We first analyzed the case for a model with constant solar metallicity and compared the models with and without 22Ne sedimentation with the observed luminosity function for a pure thin-disk population. Then we analyzed the possible effects of a thick-disk contribution. We also studied model scenarios with different metallicities, including 22Ne sedimentation. The analysis was quantified from a statistical χ2-test value for the complete and also for the most significant regions of the white dwarf luminosity function. Finally, a best-fit model along with a disk age estimate was derived. Results: Models with constant solar metallicity cannot simultaneously reproduce the peak and cutoff of the white dwarf luminosity function. The additional release of energy due to 22Ne sedimentation piles up more objects in brighter bins of the faint end of the luminosity function. The contribution of a single-burst thick-disk population increases the number of stars in the magnitude interval centered around Mbol = 15.75. The metallicity model that follows a Twarog profile is disposable. Our best-fit model was obtained when a dispersion in metallicities of about solar metallicity was considered along with a 22Ne sedimentation model, a thick-disk contribution, and an age of the thin disk of 8.8 ± 0.2 Gyr. Conclusions: Our population synthesis model is able to reproduce the local white dwarf luminosity function with a high degree of precision when a dispersion in metallicities around a model with solar values is adopted. Although the effects of 22Ne sedimentation are only marginal and the contribution of a thick-disk population is minor, both of them help in better fitting the peak and the cutoff regions of the white dwarf luminosity function
Fil: Tononi, Jordi. Universidad Politécnica de Catalunya; España
Fil: Torres, Santiago. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; España
Fil: García Berro, Enrique. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; España
Fil: Camisassa, María Eugenia. 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: 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
Fil: Rebassa Mansergas, Alberto. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; España
Materia
white dwarfs
stars: luminosity function
mass function
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:11336/125356
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/125356
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity functionTononi, JordiTorres, SantiagoGarcía Berro, EnriqueCamisassa, María EugeniaAlthaus, Leandro GabrielRebassa Mansergas, Albertowhite dwarfsstars: luminosity functionmass functionhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Aims: We analyzed the effect of the sedimentation of 22Ne on the local white dwarf luminosity function by studying scenarios under different Galactic metallicity models. Methods: We use an advanced population synthesis code based on Monte Carlo techniques to derive the synthetic luminosity function. The code incorporates the most recent and reliable cooling sequences and an accurate modeling of the observational biases under different scenarios. We first analyzed the case for a model with constant solar metallicity and compared the models with and without 22Ne sedimentation with the observed luminosity function for a pure thin-disk population. Then we analyzed the possible effects of a thick-disk contribution. We also studied model scenarios with different metallicities, including 22Ne sedimentation. The analysis was quantified from a statistical χ2-test value for the complete and also for the most significant regions of the white dwarf luminosity function. Finally, a best-fit model along with a disk age estimate was derived. Results: Models with constant solar metallicity cannot simultaneously reproduce the peak and cutoff of the white dwarf luminosity function. The additional release of energy due to 22Ne sedimentation piles up more objects in brighter bins of the faint end of the luminosity function. The contribution of a single-burst thick-disk population increases the number of stars in the magnitude interval centered around Mbol = 15.75. The metallicity model that follows a Twarog profile is disposable. Our best-fit model was obtained when a dispersion in metallicities of about solar metallicity was considered along with a 22Ne sedimentation model, a thick-disk contribution, and an age of the thin disk of 8.8 ± 0.2 Gyr. Conclusions: Our population synthesis model is able to reproduce the local white dwarf luminosity function with a high degree of precision when a dispersion in metallicities around a model with solar values is adopted. Although the effects of 22Ne sedimentation are only marginal and the contribution of a thick-disk population is minor, both of them help in better fitting the peak and the cutoff regions of the white dwarf luminosity functionFil: Tononi, Jordi. Universidad Politécnica de Catalunya; EspañaFil: Torres, Santiago. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; EspañaFil: García Berro, Enrique. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; EspañaFil: Camisassa, María Eugenia. 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: 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; ArgentinaFil: Rebassa Mansergas, Alberto. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; EspañaEDP Sciences2019-08-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/125356Tononi, Jordi; Torres, Santiago; García Berro, Enrique; Camisassa, María Eugenia; Althaus, Leandro Gabriel; et al.; Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function; EDP Sciences; Astronomy and Astrophysics; 628; A52; 6-8-2019; 1-110004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/10.1051/0004-6361/201834267info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201834267info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:37:57Zoai:ri.conicet.gov.ar:11336/125356instacron: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 10:37:57.83CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
spellingShingle Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
Tononi, Jordi
white dwarfs
stars: luminosity function
mass function
title_short Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_full Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_fullStr Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_full_unstemmed Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_sort Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function
dc.creator.none.fl_str_mv Tononi, Jordi
Torres, Santiago
García Berro, Enrique
Camisassa, María Eugenia
Althaus, Leandro Gabriel
Rebassa Mansergas, Alberto
author Tononi, Jordi
author_facet Tononi, Jordi
Torres, Santiago
García Berro, Enrique
Camisassa, María Eugenia
Althaus, Leandro Gabriel
Rebassa Mansergas, Alberto
author_role author
author2 Torres, Santiago
García Berro, Enrique
Camisassa, María Eugenia
Althaus, Leandro Gabriel
Rebassa Mansergas, Alberto
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv white dwarfs
stars: luminosity function
mass function
topic white dwarfs
stars: luminosity function
mass function
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Aims: We analyzed the effect of the sedimentation of 22Ne on the local white dwarf luminosity function by studying scenarios under different Galactic metallicity models. Methods: We use an advanced population synthesis code based on Monte Carlo techniques to derive the synthetic luminosity function. The code incorporates the most recent and reliable cooling sequences and an accurate modeling of the observational biases under different scenarios. We first analyzed the case for a model with constant solar metallicity and compared the models with and without 22Ne sedimentation with the observed luminosity function for a pure thin-disk population. Then we analyzed the possible effects of a thick-disk contribution. We also studied model scenarios with different metallicities, including 22Ne sedimentation. The analysis was quantified from a statistical χ2-test value for the complete and also for the most significant regions of the white dwarf luminosity function. Finally, a best-fit model along with a disk age estimate was derived. Results: Models with constant solar metallicity cannot simultaneously reproduce the peak and cutoff of the white dwarf luminosity function. The additional release of energy due to 22Ne sedimentation piles up more objects in brighter bins of the faint end of the luminosity function. The contribution of a single-burst thick-disk population increases the number of stars in the magnitude interval centered around Mbol = 15.75. The metallicity model that follows a Twarog profile is disposable. Our best-fit model was obtained when a dispersion in metallicities of about solar metallicity was considered along with a 22Ne sedimentation model, a thick-disk contribution, and an age of the thin disk of 8.8 ± 0.2 Gyr. Conclusions: Our population synthesis model is able to reproduce the local white dwarf luminosity function with a high degree of precision when a dispersion in metallicities around a model with solar values is adopted. Although the effects of 22Ne sedimentation are only marginal and the contribution of a thick-disk population is minor, both of them help in better fitting the peak and the cutoff regions of the white dwarf luminosity function
Fil: Tononi, Jordi. Universidad Politécnica de Catalunya; España
Fil: Torres, Santiago. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; España
Fil: García Berro, Enrique. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; España
Fil: Camisassa, María Eugenia. 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: 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
Fil: Rebassa Mansergas, Alberto. Universidad Politécnica de Catalunya; España. Instituto de Estudios Espaciales de Cataluña; España
description Aims: We analyzed the effect of the sedimentation of 22Ne on the local white dwarf luminosity function by studying scenarios under different Galactic metallicity models. Methods: We use an advanced population synthesis code based on Monte Carlo techniques to derive the synthetic luminosity function. The code incorporates the most recent and reliable cooling sequences and an accurate modeling of the observational biases under different scenarios. We first analyzed the case for a model with constant solar metallicity and compared the models with and without 22Ne sedimentation with the observed luminosity function for a pure thin-disk population. Then we analyzed the possible effects of a thick-disk contribution. We also studied model scenarios with different metallicities, including 22Ne sedimentation. The analysis was quantified from a statistical χ2-test value for the complete and also for the most significant regions of the white dwarf luminosity function. Finally, a best-fit model along with a disk age estimate was derived. Results: Models with constant solar metallicity cannot simultaneously reproduce the peak and cutoff of the white dwarf luminosity function. The additional release of energy due to 22Ne sedimentation piles up more objects in brighter bins of the faint end of the luminosity function. The contribution of a single-burst thick-disk population increases the number of stars in the magnitude interval centered around Mbol = 15.75. The metallicity model that follows a Twarog profile is disposable. Our best-fit model was obtained when a dispersion in metallicities of about solar metallicity was considered along with a 22Ne sedimentation model, a thick-disk contribution, and an age of the thin disk of 8.8 ± 0.2 Gyr. Conclusions: Our population synthesis model is able to reproduce the local white dwarf luminosity function with a high degree of precision when a dispersion in metallicities around a model with solar values is adopted. Although the effects of 22Ne sedimentation are only marginal and the contribution of a thick-disk population is minor, both of them help in better fitting the peak and the cutoff regions of the white dwarf luminosity function
publishDate 2019
dc.date.none.fl_str_mv 2019-08-06
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/11336/125356
Tononi, Jordi; Torres, Santiago; García Berro, Enrique; Camisassa, María Eugenia; Althaus, Leandro Gabriel; et al.; Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function; EDP Sciences; Astronomy and Astrophysics; 628; A52; 6-8-2019; 1-11
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/125356
identifier_str_mv Tononi, Jordi; Torres, Santiago; García Berro, Enrique; Camisassa, María Eugenia; Althaus, Leandro Gabriel; et al.; Effects of 22 Ne sedimentation and metallicity on the local 40 pc white dwarf luminosity function; EDP Sciences; Astronomy and Astrophysics; 628; A52; 6-8-2019; 1-11
0004-6361
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.aanda.org/10.1051/0004-6361/201834267
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201834267
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.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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