A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars

Autores
Martins, F.; Simón Díaz, S.; Barba, Rodolfo Hector; Gamen, Roberto Claudio; Elkstrom, S.
Año de publicación
2017
Idioma
inglés
Tipo de recurso
artículo
Estado
versión publicada
Descripción
Context. Massive star evolution remains only partly constrained. In particular, the exact role of rotation has been questioned by puzzling properties of OB stars in the Magellanic Clouds. Aims. Our goal is to study the relation between surface chemical composition and rotational velocity, and to test predictions of evolutionary models including rotation. Methods. We have performed a spectroscopic analysis of a sample of fifteen Galactic O7-8 giant stars. This sample is homogeneous in terms of mass, metallicity and evolutionary state. It is made of stars with a wide range of projected rotational velocities. Results. We show that the sample stars are located on the second half of the main sequence, in a relatively narrow mass range (25-40 M · ). Almost all stars with projected rotational velocities above 100 km s -1 have N/C ratios about ten times the initial value. Below 100 km s -1 a wide range of N/C values is observed. The relation between N/C and surface gravity is well reproduced by various sets of models. Some evolutionary models including rotation are also able to consistently explain slowly rotating, highly enriched stars. This is due to differential rotation which efficiently transports nucleosynthesis products and allows the surface to rotate slower than the core. In addition, angular momentum removal by winds amplifies surface braking on the main sequence. Comparison of the surface composition of O7-8 giant stars with a sample of B stars with initial masses about four times smaller reveal that chemical enrichment scales with initial mass, as expected from theory. Conclusions. Although evolutionary models that include rotation face difficulties in explaining the chemical properties of O- and B-type stars at low metallicity, some of them can consistently account for the properties of main-sequence Galactic O stars in the mass range 25-40 M · .
Fil: Martins, F.. Université de Montpellier; Francia
Fil: Simón Díaz, S.. Instituto de Astrofísica de Canarias; España. Universidad de La Laguna; España
Fil: Barba, Rodolfo Hector. Universidad de La Serena; Chile
Fil: Gamen, Roberto Claudio. 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: Elkstrom, S.. University of Geneva; Suiza
Materia
STARS: ABUNDANCES
STARS: ATMOSPHERES
STARS: EARLY-TYPE
STARS: FUNDAMENTAL PARAMETERS
STARS: MASSIVE
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:11336/82371
Acceder
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oai_identifier_str oai:ri.conicet.gov.ar:11336/82371
network_acronym_str CONICETDig
repository_id_str 3498
network_name_str CONICET Digital (CONICET)
spelling A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant starsMartins, F.Simón Díaz, S.Barba, Rodolfo HectorGamen, Roberto ClaudioElkstrom, S.STARS: ABUNDANCESSTARS: ATMOSPHERESSTARS: EARLY-TYPESTARS: FUNDAMENTAL PARAMETERSSTARS: MASSIVEhttps://purl.org/becyt/ford/1.3https://purl.org/becyt/ford/1Context. Massive star evolution remains only partly constrained. In particular, the exact role of rotation has been questioned by puzzling properties of OB stars in the Magellanic Clouds. Aims. Our goal is to study the relation between surface chemical composition and rotational velocity, and to test predictions of evolutionary models including rotation. Methods. We have performed a spectroscopic analysis of a sample of fifteen Galactic O7-8 giant stars. This sample is homogeneous in terms of mass, metallicity and evolutionary state. It is made of stars with a wide range of projected rotational velocities. Results. We show that the sample stars are located on the second half of the main sequence, in a relatively narrow mass range (25-40 M · ). Almost all stars with projected rotational velocities above 100 km s -1 have N/C ratios about ten times the initial value. Below 100 km s -1 a wide range of N/C values is observed. The relation between N/C and surface gravity is well reproduced by various sets of models. Some evolutionary models including rotation are also able to consistently explain slowly rotating, highly enriched stars. This is due to differential rotation which efficiently transports nucleosynthesis products and allows the surface to rotate slower than the core. In addition, angular momentum removal by winds amplifies surface braking on the main sequence. Comparison of the surface composition of O7-8 giant stars with a sample of B stars with initial masses about four times smaller reveal that chemical enrichment scales with initial mass, as expected from theory. Conclusions. Although evolutionary models that include rotation face difficulties in explaining the chemical properties of O- and B-type stars at low metallicity, some of them can consistently account for the properties of main-sequence Galactic O stars in the mass range 25-40 M · .Fil: Martins, F.. Université de Montpellier; FranciaFil: Simón Díaz, S.. Instituto de Astrofísica de Canarias; España. Universidad de La Laguna; EspañaFil: Barba, Rodolfo Hector. Universidad de La Serena; ChileFil: Gamen, Roberto Claudio. 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: Elkstrom, S.. University of Geneva; SuizaEDP Sciences2017-03info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/82371Martins, F.; Simón Díaz, S.; Barba, Rodolfo Hector; Gamen, Roberto Claudio; Elkstrom, S.; A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars; EDP Sciences; Astronomy and Astrophysics; 599; 3-2017; 30-440004-6361CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://www.aanda.org/articles/aa/abs/2017/03/aa29548-16/aa29548-16.htmlinfo:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201629548info:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-10-22T12:12:05Zoai:ri.conicet.gov.ar:11336/82371instacron: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 12:12:05.982CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse
dc.title.none.fl_str_mv A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
title A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
spellingShingle A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
Martins, F.
STARS: ABUNDANCES
STARS: ATMOSPHERES
STARS: EARLY-TYPE
STARS: FUNDAMENTAL PARAMETERS
STARS: MASSIVE
title_short A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
title_full A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
title_fullStr A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
title_full_unstemmed A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
title_sort A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars
dc.creator.none.fl_str_mv Martins, F.
Simón Díaz, S.
Barba, Rodolfo Hector
Gamen, Roberto Claudio
Elkstrom, S.
author Martins, F.
author_facet Martins, F.
Simón Díaz, S.
Barba, Rodolfo Hector
Gamen, Roberto Claudio
Elkstrom, S.
author_role author
author2 Simón Díaz, S.
Barba, Rodolfo Hector
Gamen, Roberto Claudio
Elkstrom, S.
author2_role author
author
author
author
dc.subject.none.fl_str_mv STARS: ABUNDANCES
STARS: ATMOSPHERES
STARS: EARLY-TYPE
STARS: FUNDAMENTAL PARAMETERS
STARS: MASSIVE
topic STARS: ABUNDANCES
STARS: ATMOSPHERES
STARS: EARLY-TYPE
STARS: FUNDAMENTAL PARAMETERS
STARS: MASSIVE
purl_subject.fl_str_mv https://purl.org/becyt/ford/1.3
https://purl.org/becyt/ford/1
dc.description.none.fl_txt_mv Context. Massive star evolution remains only partly constrained. In particular, the exact role of rotation has been questioned by puzzling properties of OB stars in the Magellanic Clouds. Aims. Our goal is to study the relation between surface chemical composition and rotational velocity, and to test predictions of evolutionary models including rotation. Methods. We have performed a spectroscopic analysis of a sample of fifteen Galactic O7-8 giant stars. This sample is homogeneous in terms of mass, metallicity and evolutionary state. It is made of stars with a wide range of projected rotational velocities. Results. We show that the sample stars are located on the second half of the main sequence, in a relatively narrow mass range (25-40 M · ). Almost all stars with projected rotational velocities above 100 km s -1 have N/C ratios about ten times the initial value. Below 100 km s -1 a wide range of N/C values is observed. The relation between N/C and surface gravity is well reproduced by various sets of models. Some evolutionary models including rotation are also able to consistently explain slowly rotating, highly enriched stars. This is due to differential rotation which efficiently transports nucleosynthesis products and allows the surface to rotate slower than the core. In addition, angular momentum removal by winds amplifies surface braking on the main sequence. Comparison of the surface composition of O7-8 giant stars with a sample of B stars with initial masses about four times smaller reveal that chemical enrichment scales with initial mass, as expected from theory. Conclusions. Although evolutionary models that include rotation face difficulties in explaining the chemical properties of O- and B-type stars at low metallicity, some of them can consistently account for the properties of main-sequence Galactic O stars in the mass range 25-40 M · .
Fil: Martins, F.. Université de Montpellier; Francia
Fil: Simón Díaz, S.. Instituto de Astrofísica de Canarias; España. Universidad de La Laguna; España
Fil: Barba, Rodolfo Hector. Universidad de La Serena; Chile
Fil: Gamen, Roberto Claudio. 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: Elkstrom, S.. University of Geneva; Suiza
description Context. Massive star evolution remains only partly constrained. In particular, the exact role of rotation has been questioned by puzzling properties of OB stars in the Magellanic Clouds. Aims. Our goal is to study the relation between surface chemical composition and rotational velocity, and to test predictions of evolutionary models including rotation. Methods. We have performed a spectroscopic analysis of a sample of fifteen Galactic O7-8 giant stars. This sample is homogeneous in terms of mass, metallicity and evolutionary state. It is made of stars with a wide range of projected rotational velocities. Results. We show that the sample stars are located on the second half of the main sequence, in a relatively narrow mass range (25-40 M · ). Almost all stars with projected rotational velocities above 100 km s -1 have N/C ratios about ten times the initial value. Below 100 km s -1 a wide range of N/C values is observed. The relation between N/C and surface gravity is well reproduced by various sets of models. Some evolutionary models including rotation are also able to consistently explain slowly rotating, highly enriched stars. This is due to differential rotation which efficiently transports nucleosynthesis products and allows the surface to rotate slower than the core. In addition, angular momentum removal by winds amplifies surface braking on the main sequence. Comparison of the surface composition of O7-8 giant stars with a sample of B stars with initial masses about four times smaller reveal that chemical enrichment scales with initial mass, as expected from theory. Conclusions. Although evolutionary models that include rotation face difficulties in explaining the chemical properties of O- and B-type stars at low metallicity, some of them can consistently account for the properties of main-sequence Galactic O stars in the mass range 25-40 M · .
publishDate 2017
dc.date.none.fl_str_mv 2017-03
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/11336/82371
Martins, F.; Simón Díaz, S.; Barba, Rodolfo Hector; Gamen, Roberto Claudio; Elkstrom, S.; A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars; EDP Sciences; Astronomy and Astrophysics; 599; 3-2017; 30-44
0004-6361
CONICET Digital
CONICET
url http://hdl.handle.net/11336/82371
identifier_str_mv Martins, F.; Simón Díaz, S.; Barba, Rodolfo Hector; Gamen, Roberto Claudio; Elkstrom, S.; A study of the effect of rotational mixing on massive stars evolution: Surface abundances of Galactic O7-8 giant stars; EDP Sciences; Astronomy and Astrophysics; 599; 3-2017; 30-44
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/articles/aa/abs/2017/03/aa29548-16/aa29548-16.html
info:eu-repo/semantics/altIdentifier/doi/10.1051/0004-6361/201629548
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 12.982451

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