Age and mass of solar twins constrained by lithium abundance

Aims. We analyze the non-standard mixing history of the solar twins HIP 55 459, HIP 79 672, HIP 56 948, HIP 73 815, and HIP 100 963, to determine as precisely as possible their mass and age. Methods. We computed a grid of evolutionary models with non-standard mixing at several metallicities with the...

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Principais autores:	Nascimento Jr, J. D. do, Castro, M., Meléndez, J., Bazot, M., Théado, S., Mello, G. F. Porto de, Medeiros, José Renan de
Formato:	article
Idioma:	English
Publicado em:	Astronomy & Astrophysics
Assuntos:	Stars: fundamental parameters Stars: horizontal-branch Stars: abundances Stars: evolution Stars: interiors Sun: fundamental parameters
Endereço do item:	https://repositorio.ufrn.br/jspui/handle/123456789/28996 https://doi.org/10.1051/0004-6361/200911935
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spelling	ri-123456789-289962020-05-24T09:20:58Z Age and mass of solar twins constrained by lithium abundance Nascimento Jr, J. D. do Castro, M. Meléndez, J. Bazot, M. Théado, S. Mello, G. F. Porto de Medeiros, José Renan de Stars: fundamental parameters Stars: horizontal-branch Stars: abundances Stars: evolution Stars: interiors Sun: fundamental parameters Aims. We analyze the non-standard mixing history of the solar twins HIP 55 459, HIP 79 672, HIP 56 948, HIP 73 815, and HIP 100 963, to determine as precisely as possible their mass and age. Methods. We computed a grid of evolutionary models with non-standard mixing at several metallicities with the Toulouse-Geneva code for a range of stellar masses assuming an error bar of ±50 K in Teff. We choose the evolutionary model that reproduces accurately the observed low lithium abundances observed in the solar twins. Results. Our best-fit model for each solar twin provides a mass and age solution constrained by their Li content and Teff determination. HIP 56 948 is the most likely solar-twin candidate at the present time and our analysis infers a mass of 0.994 ± 0.004 M and an age of 4.71 ± 1.39 Gyr. Conclusions. Non-standard mixing is required to explain the low Li abundances observed in solar twins. Li depletion due to additional mixing in solar twins is strongly mass dependent. An accurate lithium abundance measurement and non-standard models provide more precise information about the age and mass more robustly than determined by classical methods alone. 2020-05-18T18:20:27Z 2020-05-18T18:20:27Z 2009 article MEDEIROS, José Renan de et al. Age and mass of solar twins constrained by lithium abundance. Astronomy & Astrophysics (Berlin), v. 501, p. 687-694, 2009. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200911935. Disponível em: https://www.aanda.org/articles/aa/abs/2009/26/aa11935-09/aa11935-09.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/123456789/28996 https://doi.org/10.1051/0004-6361/200911935 en application/pdf Astronomy & Astrophysics
institution	Repositório Institucional
collection	RI - UFRN
language	English
topic	Stars: fundamental parameters Stars: horizontal-branch Stars: abundances Stars: evolution Stars: interiors Sun: fundamental parameters
spellingShingle	Stars: fundamental parameters Stars: horizontal-branch Stars: abundances Stars: evolution Stars: interiors Sun: fundamental parameters Nascimento Jr, J. D. do Castro, M. Meléndez, J. Bazot, M. Théado, S. Mello, G. F. Porto de Medeiros, José Renan de Age and mass of solar twins constrained by lithium abundance
description	Aims. We analyze the non-standard mixing history of the solar twins HIP 55 459, HIP 79 672, HIP 56 948, HIP 73 815, and HIP 100 963, to determine as precisely as possible their mass and age. Methods. We computed a grid of evolutionary models with non-standard mixing at several metallicities with the Toulouse-Geneva code for a range of stellar masses assuming an error bar of ±50 K in Teff. We choose the evolutionary model that reproduces accurately the observed low lithium abundances observed in the solar twins. Results. Our best-fit model for each solar twin provides a mass and age solution constrained by their Li content and Teff determination. HIP 56 948 is the most likely solar-twin candidate at the present time and our analysis infers a mass of 0.994 ± 0.004 M and an age of 4.71 ± 1.39 Gyr. Conclusions. Non-standard mixing is required to explain the low Li abundances observed in solar twins. Li depletion due to additional mixing in solar twins is strongly mass dependent. An accurate lithium abundance measurement and non-standard models provide more precise information about the age and mass more robustly than determined by classical methods alone.
format	article
author	Nascimento Jr, J. D. do Castro, M. Meléndez, J. Bazot, M. Théado, S. Mello, G. F. Porto de Medeiros, José Renan de
author_facet	Nascimento Jr, J. D. do Castro, M. Meléndez, J. Bazot, M. Théado, S. Mello, G. F. Porto de Medeiros, José Renan de
author_sort	Nascimento Jr, J. D. do
title	Age and mass of solar twins constrained by lithium abundance
title_short	Age and mass of solar twins constrained by lithium abundance
title_full	Age and mass of solar twins constrained by lithium abundance
title_fullStr	Age and mass of solar twins constrained by lithium abundance
title_full_unstemmed	Age and mass of solar twins constrained by lithium abundance
title_sort	age and mass of solar twins constrained by lithium abundance
publisher	Astronomy & Astrophysics
publishDate	2020
url	https://repositorio.ufrn.br/jspui/handle/123456789/28996 https://doi.org/10.1051/0004-6361/200911935
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Age and mass of solar twins constrained by lithium abundance

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