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

Martins, B. L. Canto; Lèbre, A.; Palacios, A.; Laverny, P. de; Richard, O.; Melo, C. H. F.; Nascimento Jr, J. D. do; Medeiros, José Renan de

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

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dc.contributor.author	Martins, B. L. Canto
dc.contributor.author	Lèbre, A.
dc.contributor.author	Palacios, A.
dc.contributor.author	Laverny, P. de
dc.contributor.author	Richard, O.
dc.contributor.author	Melo, C. H. F.
dc.contributor.author	Nascimento Jr, J. D. do
dc.contributor.author	Medeiros, José Renan de
dc.date.accessioned	2020-05-18T18:50:03Z
dc.date.available	2020-05-18T18:50:03Z
dc.date.issued	2011
dc.description.resumo	Aims. 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.citation	MEDEIROS, 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.doi	https://doi.org/10.1051/0004-6361/201015015
dc.identifier.issn	0004-6361 (print), 1432-0746 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29000
dc.language	en	pt_BR
dc.publisher	Astronomy & Astrophysics	pt_BR
dc.subject	Stars: abundances	pt_BR
dc.subject	Stars: fundamental parameters	pt_BR
dc.subject	Stars: atmospheres	pt_BR
dc.subject	Stars: evolution	pt_BR
dc.title	Lithium abundances and extra mixing processes in evolved stars of M 67	pt_BR
dc.type	article	pt_BR