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
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/82371
Ver los metadatos del registro completo
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oai:ri.conicet.gov.ar:11336/82371 |
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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 Técnicas2025-09-29T10:39:45Zoai: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:34982025-09-29 10:39:45.713CONICET 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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1844614423655743488 |
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13.070432 |