Lithium abundances and extra mixing processes in evolved stars of M 67

Detalhes bibliográficos
Autor(a) principal: Martins, B. L. Canto
Data de Publicação: 2011
Outros Autores: Lèbre, A., Palacios, A., Laverny, P. de, Richard, O., Melo, C. H. F., Nascimento Jr, J. D. do, Medeiros, José Renan de
Tipo de documento: Artigo
Idioma: eng
Título da fonte: Repositório Institucional da UFRN
Texto Completo: https://repositorio.ufrn.br/jspui/handle/123456789/29000
https://doi.org/10.1051/0004-6361/201015015
Resumo: Aims. We present a spectroscopic analysis of a sample of evolved stars in M 67 (turn-off, subgiant and giant stars) in order to bring observational constraints to evolutionary models taking into account non-standard transport processes. Methods. We determined the stellar parameters (Teff, log g, [Fe/H]), microturbulent and rotational velocities and, lithium abundances (ALi) for 27 evolved stars of M 67 with the spectral synthesis method based on MARCS model atmospheres. We also computed non-standard stellar evolution models, taking into account atomic diffusion and rotation-induced transport of angular momentum and chemicals that were compared with this set of homogeneous data. Results. The lithium abundances that we derive for the 27 stars in our sample follow a clear evolutionary pattern ranging from the turn-off to the Red Giant Branch. Our abundance determination confirms the well known decrease of lithium content for evolved stars. For the first time, we provide a consistent interpretation of both the surface rotation velocity and of the lithium abundance patterns observed in an homogeneous sample of TO and evolved stars of M 67. We show that the lithium evolution is determined by the evolution of the angular momentum through rotation-induced mixing in low-mass stars, in particular for those with initial masses larger than 1.30 M when at solar metallicity.
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spelling Martins, B. L. CantoLèbre, A.Palacios, A.Laverny, P. deRichard, O.Melo, C. H. F.Nascimento Jr, J. D. doMedeiros, José Renan de2020-05-18T18:50:03Z2020-05-18T18:50:03Z2011MEDEIROS, José Renan de et al. Lithium abundances and extra mixing processes in evolved stars of M?67. Astronomy & Astrophysics (Berlin. Print), v. 527, p. A94, 2011. ISSN 1432-0746. DOI https://doi.org/10.1051/0004-6361/201015015. Disponível em: https://www.aanda.org/articles/aa/abs/2011/03/aa15015-10/aa15015-10.html. Acesso em: 04 Maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.0004-6361 (print), 1432-0746 (online)https://repositorio.ufrn.br/jspui/handle/123456789/29000https://doi.org/10.1051/0004-6361/201015015Astronomy & AstrophysicsStars: abundancesStars: fundamental parametersStars: atmospheresStars: evolutionLithium abundances and extra mixing processes in evolved stars of M 67info:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleAims. We present a spectroscopic analysis of a sample of evolved stars in M 67 (turn-off, subgiant and giant stars) in order to bring observational constraints to evolutionary models taking into account non-standard transport processes. Methods. We determined the stellar parameters (Teff, log g, [Fe/H]), microturbulent and rotational velocities and, lithium abundances (ALi) for 27 evolved stars of M 67 with the spectral synthesis method based on MARCS model atmospheres. We also computed non-standard stellar evolution models, taking into account atomic diffusion and rotation-induced transport of angular momentum and chemicals that were compared with this set of homogeneous data. Results. The lithium abundances that we derive for the 27 stars in our sample follow a clear evolutionary pattern ranging from the turn-off to the Red Giant Branch. Our abundance determination confirms the well known decrease of lithium content for evolved stars. For the first time, we provide a consistent interpretation of both the surface rotation velocity and of the lithium abundance patterns observed in an homogeneous sample of TO and evolved stars of M 67. We show that the lithium evolution is determined by the evolution of the angular momentum through rotation-induced mixing in low-mass stars, in particular for those with initial masses larger than 1.30 M when at solar metallicity.engreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessORIGINALLithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdfLithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdfapplication/pdf528531https://repositorio.ufrn.br/bitstream/123456789/29000/1/LithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdff1046ae9dc8f49c1e3bff19e6a92a794MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/29000/2/license.txte9597aa2854d128fd968be5edc8a28d9MD52TEXTLithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdf.txtLithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdf.txtExtracted texttext/plain65006https://repositorio.ufrn.br/bitstream/123456789/29000/3/LithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdf.txt428cb040cedfbbd3ed34bf25059acec4MD53THUMBNAILLithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdf.jpgLithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdf.jpgGenerated Thumbnailimage/jpeg1664https://repositorio.ufrn.br/bitstream/123456789/29000/4/LithiumAbundancesAndExtraMixingProcesses_Medeiros_2011.pdf.jpg7dec867638dd2d015d81378138928e73MD54123456789/290002020-05-24 06:21:10.446oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2020-05-24T09:21:10Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false
dc.title.pt_BR.fl_str_mv Lithium abundances and extra mixing processes in evolved stars of M 67
title Lithium abundances and extra mixing processes in evolved stars of M 67
spellingShingle Lithium abundances and extra mixing processes in evolved stars of M 67
Martins, B. L. Canto
Stars: abundances
Stars: fundamental parameters
Stars: atmospheres
Stars: evolution
title_short Lithium abundances and extra mixing processes in evolved stars of M 67
title_full Lithium abundances and extra mixing processes in evolved stars of M 67
title_fullStr Lithium abundances and extra mixing processes in evolved stars of M 67
title_full_unstemmed Lithium abundances and extra mixing processes in evolved stars of M 67
title_sort Lithium abundances and extra mixing processes in evolved stars of M 67
author Martins, B. L. Canto
author_facet Martins, B. L. Canto
Lèbre, A.
Palacios, A.
Laverny, P. de
Richard, O.
Melo, C. H. F.
Nascimento Jr, J. D. do
Medeiros, José Renan de
author_role author
author2 Lèbre, A.
Palacios, A.
Laverny, P. de
Richard, O.
Melo, C. H. F.
Nascimento Jr, J. D. do
Medeiros, José Renan de
author2_role author
author
author
author
author
author
author
dc.contributor.author.fl_str_mv Martins, B. L. Canto
Lèbre, A.
Palacios, A.
Laverny, P. de
Richard, O.
Melo, C. H. F.
Nascimento Jr, J. D. do
Medeiros, José Renan de
dc.subject.por.fl_str_mv Stars: abundances
Stars: fundamental parameters
Stars: atmospheres
Stars: evolution
topic Stars: abundances
Stars: fundamental parameters
Stars: atmospheres
Stars: evolution
description Aims. We present a spectroscopic analysis of a sample of evolved stars in M 67 (turn-off, subgiant and giant stars) in order to bring observational constraints to evolutionary models taking into account non-standard transport processes. Methods. We determined the stellar parameters (Teff, log g, [Fe/H]), microturbulent and rotational velocities and, lithium abundances (ALi) for 27 evolved stars of M 67 with the spectral synthesis method based on MARCS model atmospheres. We also computed non-standard stellar evolution models, taking into account atomic diffusion and rotation-induced transport of angular momentum and chemicals that were compared with this set of homogeneous data. Results. The lithium abundances that we derive for the 27 stars in our sample follow a clear evolutionary pattern ranging from the turn-off to the Red Giant Branch. Our abundance determination confirms the well known decrease of lithium content for evolved stars. For the first time, we provide a consistent interpretation of both the surface rotation velocity and of the lithium abundance patterns observed in an homogeneous sample of TO and evolved stars of M 67. We show that the lithium evolution is determined by the evolution of the angular momentum through rotation-induced mixing in low-mass stars, in particular for those with initial masses larger than 1.30 M when at solar metallicity.
publishDate 2011
dc.date.issued.fl_str_mv 2011
dc.date.accessioned.fl_str_mv 2020-05-18T18:50:03Z
dc.date.available.fl_str_mv 2020-05-18T18:50:03Z
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dc.type.driver.fl_str_mv info:eu-repo/semantics/article
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dc.identifier.citation.fl_str_mv MEDEIROS, José Renan de et al. Lithium abundances and extra mixing processes in evolved stars of M?67. Astronomy & Astrophysics (Berlin. Print), v. 527, p. A94, 2011. ISSN 1432-0746. DOI https://doi.org/10.1051/0004-6361/201015015. Disponível em: https://www.aanda.org/articles/aa/abs/2011/03/aa15015-10/aa15015-10.html. Acesso em: 04 Maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.
dc.identifier.uri.fl_str_mv https://repositorio.ufrn.br/jspui/handle/123456789/29000
dc.identifier.issn.none.fl_str_mv 0004-6361 (print), 1432-0746 (online)
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1051/0004-6361/201015015
identifier_str_mv MEDEIROS, José Renan de et al. Lithium abundances and extra mixing processes in evolved stars of M?67. Astronomy & Astrophysics (Berlin. Print), v. 527, p. A94, 2011. ISSN 1432-0746. DOI https://doi.org/10.1051/0004-6361/201015015. Disponível em: https://www.aanda.org/articles/aa/abs/2011/03/aa15015-10/aa15015-10.html. Acesso em: 04 Maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.
0004-6361 (print), 1432-0746 (online)
url https://repositorio.ufrn.br/jspui/handle/123456789/29000
https://doi.org/10.1051/0004-6361/201015015
dc.language.iso.fl_str_mv eng
language eng
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dc.publisher.none.fl_str_mv Astronomy & Astrophysics
publisher.none.fl_str_mv Astronomy & Astrophysics
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