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 stella...

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Principais autores: Martins, B. L. Canto, Lèbre, A., de Laverny, P., Melo, C. H. F., Nascimento Júnior, José Dias do, de Medeiros, J. R.
Formato: article
Idioma:English
Publicado em: EDP Sciences
Assuntos:
Stars: atmospheres
Stars: evolution
Stars: binaries: general
Stars: fundamental parameters
Endereço do item:https://repositorio.ufrn.br/jspui/handle/123456789/29003
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spelling ri-123456789-290032020-05-24T09:21:20Z 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. Stars: atmospheres Stars: evolution Stars: binaries: general Stars: fundamental parameters 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 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 2020-05-19T17:26:09Z 2020-05-19T17:26:09Z 2005-12-29 article 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” 1678-765X 10.1051/0004-6361:20053334 https://repositorio.ufrn.br/jspui/handle/123456789/29003 en application/pdf EDP Sciences
institution Repositório Institucional
collection RI - UFRN
language English
topic Stars: atmospheres
Stars: evolution
Stars: binaries: general
Stars: fundamental parameters
spellingShingle Stars: atmospheres
Stars: evolution
Stars: binaries: general
Stars: fundamental parameters
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
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 () 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.
de Laverny, P.
Melo, C. H. F.
Nascimento Júnior, José Dias do
de Medeiros, J. R.
author_facet Martins, B. L. Canto
Lèbre, A.
de Laverny, P.
Melo, C. H. F.
Nascimento Júnior, José Dias do
de Medeiros, J. R.
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 EDP Sciences
publishDate 2020
url https://repositorio.ufrn.br/jspui/handle/123456789/29003
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