Lithium abundances and extra mixing processes in evolved stars of M 67

dc.contributor.authorMartins, B. L. Canto
dc.contributor.authorLèbre, A.
dc.contributor.authorPalacios, A.
dc.contributor.authorLaverny, P. de
dc.contributor.authorRichard, O.
dc.contributor.authorMelo, C. H. F.
dc.contributor.authorNascimento Jr, J. D. do
dc.contributor.authorMedeiros, José Renan de
dc.date.accessioned2020-05-18T18:50:03Z
dc.date.available2020-05-18T18:50:03Z
dc.date.issued2011
dc.description.resumoAims. 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.pt_BR
dc.identifier.citationMEDEIROS, 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.pt_BR
dc.identifier.doihttps://doi.org/10.1051/0004-6361/201015015
dc.identifier.issn0004-6361 (print), 1432-0746 (online)
dc.identifier.urihttps://repositorio.ufrn.br/jspui/handle/123456789/29000
dc.languageenpt_BR
dc.publisherAstronomy & Astrophysicspt_BR
dc.subjectStars: abundancespt_BR
dc.subjectStars: fundamental parameterspt_BR
dc.subjectStars: atmospherespt_BR
dc.subjectStars: evolutionpt_BR
dc.titleLithium abundances and extra mixing processes in evolved stars of M 67pt_BR
dc.typearticlept_BR

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