Lithium abundances and extra mixing processes in evolved stars of M 67
Autor(a) principal: | |
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Data de Publicação: | 2011 |
Outros Autores: | , , , , , , |
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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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 |
dc.type.status.fl_str_mv |
info:eu-repo/semantics/publishedVersion |
dc.type.driver.fl_str_mv |
info:eu-repo/semantics/article |
format |
article |
status_str |
publishedVersion |
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 |
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eng |
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info:eu-repo/semantics/openAccess |
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openAccess |
dc.publisher.none.fl_str_mv |
Astronomy & Astrophysics |
publisher.none.fl_str_mv |
Astronomy & Astrophysics |
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Repositório Institucional da UFRN |
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