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

Martins, B. L. Canto; Lèbre, A.; de Laverny, P.; Melo, C. H. F.; Nascimento Júnior, José Dias do; de Medeiros, J. R.

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	de Laverny, P.
dc.contributor.author	Melo, C. H. F.
dc.contributor.author	Nascimento Júnior, José Dias do
dc.contributor.author	de Medeiros, J. R.
dc.date.accessioned	2020-05-19T17:26:09Z
dc.date.available	2020-05-19T17:26:09Z
dc.date.issued	2005-12-29
dc.description.abstract	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 () 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.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 () 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	MARTINS, B. L. Canto; LÈBRE, A.; LAVERNY, P. de; MELO, C. H. F.; NASCIMENTO JUNIOR, J. D. do; RICHARD, O.; MEDEIROS, J. R. de. S1242: a lithium-rich subgiant star in the open cluster m⠩67. : a lithium-rich subgiant star in the open cluster M 67. Astronomy & Astrophysics, [s.l.], v. 451, n. 3, p. 993-997, 4 maio 2006. EDP Sciences. Disponível em: http://dx.doi.org/10.1051/0004-6361:20053334. Acesso em: 12 mai. 2020. Com permissão da As “Reproduzidotronomy & Astrophysics, © ESO”	pt_BR
dc.identifier.issn	1678-765X
dc.identifier.issn	10.1051/0004-6361:20053334
dc.identifier.uri	https://repositorio.ufrn.br/jspui/handle/123456789/29003
dc.language	en	pt_BR
dc.publisher	EDP Sciences	pt_BR
dc.subject	Stars: atmospheres	pt_BR
dc.subject	Stars: evolution	pt_BR
dc.subject	Stars: binaries: general	pt_BR
dc.subject	Stars: fundamental parameters	pt_BR
dc.title	S1242: a lithium-rich subgiant star in the open cluster M 67	pt_BR
dc.type	article	pt_BR