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

Nascimento Jr, J. D. do; Costa, J. S. da; Medeiros, José Renan de

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

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dc.contributor.author	Nascimento Jr, J. D. do
dc.contributor.author	Costa, J. S. da
dc.contributor.author	Medeiros, José Renan de
dc.date.accessioned	2020-05-18T18:37:51Z
dc.date.available	2020-05-18T18:37:51Z
dc.date.issued	2010
dc.description.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.	pt_BR
dc.identifier.citation	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.	pt_BR
dc.identifier.doi	https://doi.org/10.1051/0004-6361/200811026
dc.identifier.issn	0004-6361 (print), 1432-0746 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/28998
dc.language	en	pt_BR
dc.publisher	Astronomy & Astrophysics	pt_BR
dc.subject	Hertzsprung-Russell and C-M diagrams	pt_BR
dc.subject	Stars: rotation	pt_BR
dc.subject	Stars: abundances	pt_BR
dc.subject	Stars: fundamental parameters	pt_BR
dc.title	Rotation and lithium abundance of solar-analog stars: Theoretical analysis of observations	pt_BR
dc.type	article	pt_BR