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

Age and mass of solar twins constrained by lithium abundance

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dc.contributor.author	Nascimento Jr, J. D. do
dc.contributor.author	Castro, M.
dc.contributor.author	Meléndez, J.
dc.contributor.author	Bazot, M.
dc.contributor.author	Théado, S.
dc.contributor.author	Mello, G. F. Porto de
dc.contributor.author	Medeiros, José Renan de
dc.date.accessioned	2020-05-18T18:20:27Z
dc.date.available	2020-05-18T18:20:27Z
dc.date.issued	2009
dc.description.resumo	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.	pt_BR
dc.identifier.citation	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.	pt_BR
dc.identifier.doi	https://doi.org/10.1051/0004-6361/200911935
dc.identifier.issn	0004-6361 (print), 1432-0746 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/28996
dc.language	en	pt_BR
dc.publisher	Astronomy & Astrophysics	pt_BR
dc.subject	Stars: fundamental parameters	pt_BR
dc.subject	Stars: horizontal-branch	pt_BR
dc.subject	Stars: abundances	pt_BR
dc.subject	Stars: evolution	pt_BR
dc.subject	Stars: interiors	pt_BR
dc.subject	Sun: fundamental parameters	pt_BR
dc.title	Age and mass of solar twins constrained by lithium abundance	pt_BR
dc.type	article	pt_BR