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

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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 stel...

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Principais autores: Martins, B. L. Canto, Lèbre, A., Laverny, P. de, Melo, C. H. F., Nascimento Jr, J. D. do, Richard, O., Medeiros, José Renan de
Formato: article
Idioma:English
Publicado em: Astronomy & Astrophysics
Assuntos:
Stars: binaries: general
Stars: abundances
Stars: fundamental parameters
Stars: atmospheres
Stars: evolution
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/28986
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spelling ri-123456789-289862020-05-17T08:00:04Z 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 Stars: binaries: general Stars: abundances Stars: fundamental parameters Stars: atmospheres Stars: evolution 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. 2020-05-15T14:19:36Z 2020-05-15T14:19:36Z 2006-05-04 article 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. 0004-6361 (print); 1432-0746 (online) https://repositorio.ufrn.br/jspui/handle/123456789/28986 10.1051/0004-6361:20053334 en application/pdf Astronomy & Astrophysics
institution Repositório Institucional
collection RI - UFRN
language English
topic Stars: binaries: general
Stars: abundances
Stars: fundamental parameters
Stars: atmospheres
Stars: evolution
spellingShingle Stars: binaries: general
Stars: abundances
Stars: fundamental parameters
Stars: atmospheres
Stars: evolution
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
description 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.
format article
author Martins, B. L. Canto
Lèbre, A.
Laverny, P. de
Melo, C. H. F.
Nascimento Jr, J. D. do
Richard, O.
Medeiros, José Renan de
author_facet Martins, B. L. Canto
Lèbre, A.
Laverny, P. de
Melo, C. H. F.
Nascimento Jr, J. D. do
Richard, O.
Medeiros, José Renan de
author_sort Martins, B. L. Canto
title S1242: a lithium-rich subgiant star in the open cluster M 67
title_short S1242: a lithium-rich subgiant star in the open cluster M 67
title_full S1242: a lithium-rich subgiant star in the open cluster M 67
title_fullStr S1242: a lithium-rich subgiant star in the open cluster M 67
title_full_unstemmed S1242: a lithium-rich subgiant star in the open cluster M 67
title_sort s1242: a lithium-rich subgiant star in the open cluster m 67
publisher Astronomy & Astrophysics
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/28986
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