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

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 c...

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Autores: Tononi García, Jordi, Torres Gil, Santiago|||0000-0001-5777-5251, García-Berro Montilla, Enrique|||0000-0002-1623-5838, Camisassa, María E., Althaus, Leandro G., Rebassa Mansergas, Alberto|||0000-0002-6153-7173
Tipo de recurso: artículo
Fecha de publicación:2019
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/179938
Acceso en línea:https://hdl.handle.net/2117/179938
https://dx.doi.org/10.1051/0004-6361/201834267
Access Level:acceso abierto
Palabra clave:White dwarf stars
Stars--Luminosity function
White dwarfs
Stars - luminosity function
mass function
Estels nans
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
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oai_identifier_str oai:upcommons.upc.edu:2117/179938
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network_name_str España
repository_id_str
spelling Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity functionTononi García, JordiTorres Gil, Santiago|||0000-0001-5777-5251García-Berro Montilla, Enrique|||0000-0002-1623-5838Camisassa, María E.Althaus, Leandro G.Rebassa Mansergas, Alberto|||0000-0002-6153-7173White dwarf starsStars--Luminosity functionWhite dwarfsStars - luminosity functionmass functionEstels nansÀrees temàtiques de la UPC::Física::Astronomia i astrofísicaWe 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 ¿ 2 -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.Peer ReviewedEDP Sciences20192019-08-0620202020-03-16journal articlehttp://purl.org/coar/resource_type/c_6501VoRhttp://purl.org/coar/version/c_970fb48d4fbd8a85info:eu-repo/semantics/articleapplication/pdfhttps://hdl.handle.net/2117/179938https://dx.doi.org/10.1051/0004-6361/201834267reponame:UPCommons. Portal del coneixement obert de la UPCinstname:Universitat Politècnica de Catalunya (UPC)InglésengAgencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016 AYA2017-86274-P DEL ENFRIAMIENTO A LAS EXPLOSIONES: LA FISICA DE LOS OBJETOS COMPACTOSopen accesshttp://purl.org/coar/access_right/c_abf2Attribution-NonCommercial-NoDerivs 3.0 Spainhttp://creativecommons.org/licenses/by-nc-nd/3.0/es/info:eu-repo/semantics/openAccessoai:upcommons.upc.edu:2117/1799382026-05-27T15:37:01Z
dc.title.none.fl_str_mv Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
spellingShingle Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
Tononi García, Jordi
White dwarf stars
Stars--Luminosity function
White dwarfs
Stars - luminosity function
mass function
Estels nans
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
title_short Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_full Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_fullStr Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_full_unstemmed Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
title_sort Effects of Ne-22 sedimentation and metallicity on the local 40 pc white dwarf luminosity function
dc.creator.none.fl_str_mv Tononi García, Jordi
Torres Gil, Santiago|||0000-0001-5777-5251
García-Berro Montilla, Enrique|||0000-0002-1623-5838
Camisassa, María E.
Althaus, Leandro G.
Rebassa Mansergas, Alberto|||0000-0002-6153-7173
author Tononi García, Jordi
author_facet Tononi García, Jordi
Torres Gil, Santiago|||0000-0001-5777-5251
García-Berro Montilla, Enrique|||0000-0002-1623-5838
Camisassa, María E.
Althaus, Leandro G.
Rebassa Mansergas, Alberto|||0000-0002-6153-7173
author_role author
author2 Torres Gil, Santiago|||0000-0001-5777-5251
García-Berro Montilla, Enrique|||0000-0002-1623-5838
Camisassa, María E.
Althaus, Leandro G.
Rebassa Mansergas, Alberto|||0000-0002-6153-7173
author2_role author
author
author
author
author
dc.subject.none.fl_str_mv White dwarf stars
Stars--Luminosity function
White dwarfs
Stars - luminosity function
mass function
Estels nans
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
topic White dwarf stars
Stars--Luminosity function
White dwarfs
Stars - luminosity function
mass function
Estels nans
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
description 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 ¿ 2 -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
2019-08-06
2020
2020-03-16
dc.type.none.fl_str_mv journal article
http://purl.org/coar/resource_type/c_6501
VoR
http://purl.org/coar/version/c_970fb48d4fbd8a85
dc.type.openaire.fl_str_mv info:eu-repo/semantics/article
format article
dc.identifier.none.fl_str_mv https://hdl.handle.net/2117/179938
https://dx.doi.org/10.1051/0004-6361/201834267
url https://hdl.handle.net/2117/179938
https://dx.doi.org/10.1051/0004-6361/201834267
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.relation.none.fl_str_mv Agencia Estatal de Investigación http://doi.org/10.13039/501100011033 Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016 AYA2017-86274-P DEL ENFRIAMIENTO A LAS EXPLOSIONES: LA FISICA DE LOS OBJETOS COMPACTOS
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
Attribution-NonCommercial-NoDerivs 3.0 Spain
http://creativecommons.org/licenses/by-nc-nd/3.0/es/
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.publisher.none.fl_str_mv EDP Sciences
publisher.none.fl_str_mv EDP Sciences
dc.source.none.fl_str_mv reponame:UPCommons. Portal del coneixement obert de la UPC
instname:Universitat Politècnica de Catalunya (UPC)
instname_str Universitat Politècnica de Catalunya (UPC)
reponame_str UPCommons. Portal del coneixement obert de la UPC
collection UPCommons. Portal del coneixement obert de la UPC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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