S1242: a lithium-rich subgiant star in the open cluster M 67

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

S1242: a lithium-rich subgiant star in the open cluster M 67

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dc.contributor.author	Martins, B. L. Canto
dc.contributor.author	Lèbre, A.
dc.contributor.author	Laverny, P. de
dc.contributor.author	Melo, C. H. F.
dc.contributor.author	Nascimento Jr, J. D. do
dc.contributor.author	Richard, O.
dc.contributor.author	Medeiros, José Renan de
dc.date.accessioned	2020-05-15T14:19:36Z
dc.date.available	2020-05-15T14:19:36Z
dc.date.issued	2006-05-04
dc.description.resumo	Aims. We report the serendipitous discovery of a lithium-rich subgiant star, S1242. This object is member of a large eccentricity spectroscopic binary system in the solar-age open cluster M 67. Methods. Using VLT/FLAMES-UVES observations and synthetic spectrum analysis, we derived for this star stellar parameters (temperature, gravity, metallicity and rotational velocity) and a surface Li abundance (ALi = 2.7) larger than the higher abundance of M 67 stars near the turn-off. Results. The high Li abundance we found in S1242 points to an excess of lithium at the subgiant stage. We discuss two possible explanations for this unusually high Li content in this binary system: a preservation of the Li at the turn-off stage due to tidal effects, or an efficient dredge-up of Li, hidden below the convective zone by atomic diffusion occuring in the post turn-off stage.	pt_BR
dc.identifier.citation	MEDEIROS, Jose Renan de et al. S1242: A lithium-rich subgiant star in M67. Astronomy & Astrophysics (Berlin), França, v. 451, n. 3, p. 993-997, 2006. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361:20053334. Disponível em: https://www.aanda.org/articles/aa/pdf/2006/21/aa3334-05.pdf. Acesso em: 27 abr. 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.	pt_BR
dc.identifier.doi	10.1051/0004-6361:20053334
dc.identifier.issn	0004-6361 (print); 1432-0746 (online)
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/28986
dc.language	en	pt_BR
dc.publisher	Astronomy & Astrophysics	pt_BR
dc.subject	Stars: binaries: general	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	S1242: a lithium-rich subgiant star in the open cluster M 67	pt_BR
dc.type	article	pt_BR