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Title: S1242: a lithium-rich subgiant star in the open cluster M 67
Authors: Martins, B. L. Canto
Lèbre, A.
Laverny, P. de
Melo, C. H. F.
Nascimento Jr, J. D. do
Richard, O.
Medeiros, José Renan de
Keywords: Stars: binaries: general;Stars: abundances;Stars: fundamental parameters;Stars: atmospheres;Stars: evolution
Issue Date: 4-May-2006
Publisher: Astronomy & Astrophysics
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 Disponível em: Acesso em: 27 abr. 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO.
Portuguese 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 (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.
ISSN: 0004-6361 (print); 1432-0746 (online)
Appears in Collections:CCET - DFTE - Artigos publicados em periódicos

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