Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations

Detalhes bibliográficos
Autor(a) principal: Nascimento Jr, J. D. do
Data de Publicação: 2010
Outros Autores: Costa, J. S. da, 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/123456789/28998
https://doi.org/10.1051/0004-6361/200811026
Resumo: Context. Rotational velocity, lithium abundance, and the mass depth of the outer convective zone are key parameters in the study of the processes at work in the stellar interior, in particular when examining the poorly understood processes operating in the interior of solar–analog stars. Aims. We investigate whether the large dispersion in the observed lithium abundances of solar-analog stars can be explained by the depth behavior of the outer convective zone masses, within the framework of the standard convection model based on the local mixing-length theory. We also analyze the link between rotation and lithium abundance in solar-analog stars. Methods. We computed a new extensive grid of stellar evolutionary models, applicable to solar-analog stars, for a finely discretized set of mass and metallicity. From these models, the stellar mass, age, and mass depth of the outer convective zone were estimated for 117 solar-analog stars, using Teff and [Fe/H] available in the literature, and the new HIPPARCOS trigonometric parallax measurements. Results. We determine the age and mass of the outer convective zone for a bona fide sample of 117 solar-analog stars. No significant one-to-one correlation is found between the computed convection zone mass and published lithium abundance, indicating that the large A(Li) dispersion in solar analogs cannot be explained by the classical framework of envelope convective mixing coupled with lithium depletion at the bottom of the convection zone. Conclusions. These results illustrate the need for an extra-mixing process to explain lithium behavior in solar-analog stars, such as, shear mixing caused by differential rotation. To derive a more realistic definition of solar-analog stars, as well as solar-twin stars, it seems important to consider the inner physical properties of stars, such as convection, hence rotation and magnetic properties.
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spelling Nascimento Jr, J. D. doCosta, J. S. daMedeiros, José Renan de2020-05-18T18:37:51Z2020-05-18T18:37:51Z2010NASCIMENTO, J. D.; COSTA, J. S. da; MEDEIROS, José Renan de. Rotation and lithium abundance of solar-analog stars. Astronomy & Astrophysics (Berlin. Print), v. 519, p. A101, 2010. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200811026. Disponível em: https://www.aanda.org/articles/aa/abs/2010/11/aa11026-08/aa11026-08.html. Acesso em: 18 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.0004-6361 (print), 1432-0746 (online)https://repositorio.ufrn.br/jspui/handle/123456789/28998https://doi.org/10.1051/0004-6361/200811026Astronomy & AstrophysicsHertzsprung-Russell and C-M diagramsStars: rotationStars: abundancesStars: fundamental parametersRotation and lithium abundance of solar-analog stars: Theoretical analysis of observationsinfo:eu-repo/semantics/publishedVersioninfo:eu-repo/semantics/articleContext. Rotational velocity, lithium abundance, and the mass depth of the outer convective zone are key parameters in the study of the processes at work in the stellar interior, in particular when examining the poorly understood processes operating in the interior of solar–analog stars. Aims. We investigate whether the large dispersion in the observed lithium abundances of solar-analog stars can be explained by the depth behavior of the outer convective zone masses, within the framework of the standard convection model based on the local mixing-length theory. We also analyze the link between rotation and lithium abundance in solar-analog stars. Methods. We computed a new extensive grid of stellar evolutionary models, applicable to solar-analog stars, for a finely discretized set of mass and metallicity. From these models, the stellar mass, age, and mass depth of the outer convective zone were estimated for 117 solar-analog stars, using Teff and [Fe/H] available in the literature, and the new HIPPARCOS trigonometric parallax measurements. Results. We determine the age and mass of the outer convective zone for a bona fide sample of 117 solar-analog stars. No significant one-to-one correlation is found between the computed convection zone mass and published lithium abundance, indicating that the large A(Li) dispersion in solar analogs cannot be explained by the classical framework of envelope convective mixing coupled with lithium depletion at the bottom of the convection zone. Conclusions. These results illustrate the need for an extra-mixing process to explain lithium behavior in solar-analog stars, such as, shear mixing caused by differential rotation. To derive a more realistic definition of solar-analog stars, as well as solar-twin stars, it seems important to consider the inner physical properties of stars, such as convection, hence rotation and magnetic properties.engreponame:Repositório Institucional da UFRNinstname:Universidade Federal do Rio Grande do Norte (UFRN)instacron:UFRNinfo:eu-repo/semantics/openAccessORIGINALRotationAndLithiumAbundance_Medeiros_2010.pdfRotationAndLithiumAbundance_Medeiros_2010.pdfapplication/pdf565434https://repositorio.ufrn.br/bitstream/123456789/28998/1/RotationAndLithiumAbundance_Medeiros_2010.pdf41c12ae93998369a45300fdbf4310b65MD51LICENSElicense.txtlicense.txttext/plain; charset=utf-81484https://repositorio.ufrn.br/bitstream/123456789/28998/2/license.txte9597aa2854d128fd968be5edc8a28d9MD52TEXTRotationAndLithiumAbundance_Medeiros_2010.pdf.txtRotationAndLithiumAbundance_Medeiros_2010.pdf.txtExtracted texttext/plain41124https://repositorio.ufrn.br/bitstream/123456789/28998/3/RotationAndLithiumAbundance_Medeiros_2010.pdf.txt4ef22ce6f979a20f947ba4f2c2f728fbMD53THUMBNAILRotationAndLithiumAbundance_Medeiros_2010.pdf.jpgRotationAndLithiumAbundance_Medeiros_2010.pdf.jpgGenerated Thumbnailimage/jpeg1687https://repositorio.ufrn.br/bitstream/123456789/28998/4/RotationAndLithiumAbundance_Medeiros_2010.pdf.jpgad3ffdbb63db6f4095662ae111b5a9beMD54123456789/289982020-05-24 06:21:02.488oai:https://repositorio.ufrn.br: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Repositório de PublicaçõesPUBhttp://repositorio.ufrn.br/oai/opendoar:2020-05-24T09:21:02Repositório Institucional da UFRN - Universidade Federal do Rio Grande do Norte (UFRN)false
dc.title.pt_BR.fl_str_mv Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
title Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
spellingShingle Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
Nascimento Jr, J. D. do
Hertzsprung-Russell and C-M diagrams
Stars: rotation
Stars: abundances
Stars: fundamental parameters
title_short Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
title_full Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
title_fullStr Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
title_full_unstemmed Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
title_sort Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations
author Nascimento Jr, J. D. do
author_facet Nascimento Jr, J. D. do
Costa, J. S. da
Medeiros, José Renan de
author_role author
author2 Costa, J. S. da
Medeiros, José Renan de
author2_role author
author
dc.contributor.author.fl_str_mv Nascimento Jr, J. D. do
Costa, J. S. da
Medeiros, José Renan de
dc.subject.por.fl_str_mv Hertzsprung-Russell and C-M diagrams
Stars: rotation
Stars: abundances
Stars: fundamental parameters
topic Hertzsprung-Russell and C-M diagrams
Stars: rotation
Stars: abundances
Stars: fundamental parameters
description Context. Rotational velocity, lithium abundance, and the mass depth of the outer convective zone are key parameters in the study of the processes at work in the stellar interior, in particular when examining the poorly understood processes operating in the interior of solar–analog stars. Aims. We investigate whether the large dispersion in the observed lithium abundances of solar-analog stars can be explained by the depth behavior of the outer convective zone masses, within the framework of the standard convection model based on the local mixing-length theory. We also analyze the link between rotation and lithium abundance in solar-analog stars. Methods. We computed a new extensive grid of stellar evolutionary models, applicable to solar-analog stars, for a finely discretized set of mass and metallicity. From these models, the stellar mass, age, and mass depth of the outer convective zone were estimated for 117 solar-analog stars, using Teff and [Fe/H] available in the literature, and the new HIPPARCOS trigonometric parallax measurements. Results. We determine the age and mass of the outer convective zone for a bona fide sample of 117 solar-analog stars. No significant one-to-one correlation is found between the computed convection zone mass and published lithium abundance, indicating that the large A(Li) dispersion in solar analogs cannot be explained by the classical framework of envelope convective mixing coupled with lithium depletion at the bottom of the convection zone. Conclusions. These results illustrate the need for an extra-mixing process to explain lithium behavior in solar-analog stars, such as, shear mixing caused by differential rotation. To derive a more realistic definition of solar-analog stars, as well as solar-twin stars, it seems important to consider the inner physical properties of stars, such as convection, hence rotation and magnetic properties.
publishDate 2010
dc.date.issued.fl_str_mv 2010
dc.date.accessioned.fl_str_mv 2020-05-18T18:37:51Z
dc.date.available.fl_str_mv 2020-05-18T18:37:51Z
dc.type.status.fl_str_mv info:eu-repo/semantics/publishedVersion
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status_str publishedVersion
dc.identifier.citation.fl_str_mv NASCIMENTO, J. D.; COSTA, J. S. da; MEDEIROS, José Renan de. Rotation and lithium abundance of solar-analog stars. Astronomy & Astrophysics (Berlin. Print), v. 519, p. A101, 2010. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200811026. Disponível em: https://www.aanda.org/articles/aa/abs/2010/11/aa11026-08/aa11026-08.html. Acesso em: 18 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.
dc.identifier.uri.fl_str_mv https://repositorio.ufrn.br/jspui/handle/123456789/28998
dc.identifier.issn.none.fl_str_mv 0004-6361 (print), 1432-0746 (online)
dc.identifier.doi.none.fl_str_mv https://doi.org/10.1051/0004-6361/200811026
identifier_str_mv NASCIMENTO, J. D.; COSTA, J. S. da; MEDEIROS, José Renan de. Rotation and lithium abundance of solar-analog stars. Astronomy & Astrophysics (Berlin. Print), v. 519, p. A101, 2010. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200811026. Disponível em: https://www.aanda.org/articles/aa/abs/2010/11/aa11026-08/aa11026-08.html. Acesso em: 18 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.
0004-6361 (print), 1432-0746 (online)
url https://repositorio.ufrn.br/jspui/handle/123456789/28998
https://doi.org/10.1051/0004-6361/200811026
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