Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant
Aims. We report the detection of an unusually high lithium content in HD 232 862, a field giant classified as a G8II star, and hostinga magnetic field. Methods. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we collected high resolution and high signalto-noise spectra of three gian...
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ftunifrgnorteir:oai:https://repositorio.ufrn.br:123456789/28994 2023-05-15T18:50:47+02:00 Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant Lèbre, A. Palacios, A. Nascimento Jr., J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. Laverny, P. de Medeiros, José Renan de 2009-07-22 application/pdf https://repositorio.ufrn.br/jspui/handle/123456789/28994 https://doi.org/10.1051/0004-6361/200912038 en eng Astronomy & Astrophysics MEDEIROS, José Renan de et al. Lithium and magnetic fields in giant stars. Astronomy & Astrophysics (Berlin. Print), v. 504, p. 1011-1019, 2009. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200912038. Disponível: https://www.aanda.org/articles/aa/abs/2009/36/aa12038-09/aa12038-09.html. Acesso em: 18 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO. 0004-6361 (print), 1432-0746 (online) https://repositorio.ufrn.br/jspui/handle/123456789/28994 doi:10.1051/0004-6361/200912038 Stars: abundances Stars: evolution Stars: magnetic fields Stars: individual: HD 232 862 Stars: individual: KU Peg article 2009 ftunifrgnorteir https://doi.org/10.1051/0004-6361/200912038 2021-12-19T17:53:40Z Aims. We report the detection of an unusually high lithium content in HD 232 862, a field giant classified as a G8II star, and hostinga magnetic field. Methods. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we collected high resolution and high signalto-noise spectra of three giants: HD 232 862, KU Peg and HD 21 018. From spectral synthesis we inferred stellar parameters and measured lithium abundances that we compared to predictions from evolutionary models. We also analysed Stokes V signatures, looking for a magnetic field on these giants. Results. HD 232 862, presents a very high abundance of lithium (ALi = 2.45 ± 0.25 dex), far in excess of the theoretically value expected at this spectral type and for this luminosity class (i.e., G8II). The evolutionary stage of HD 232 862 was determined, and it suggests a mass in the lower part of the [1.0 M, 3.5 M] mass interval, likely 1.5–2.0 M, at the bottom of the red giant branch. Also, a time variable Stokes V signature was detected in the data of HD 232 862 and KU Peg, pointing to the presence of a magnetic field at the surface of these two rapidly rotating active stars. Article in Journal/Newspaper narval narval Universidade Federal do Rio Grande do Norte: Repositório Institucional (RI UFRN) Astronomy & Astrophysics 504 3 1011 1019 |
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Universidade Federal do Rio Grande do Norte: Repositório Institucional (RI UFRN) |
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language |
English |
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Stars: abundances Stars: evolution Stars: magnetic fields Stars: individual: HD 232 862 Stars: individual: KU Peg |
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Stars: abundances Stars: evolution Stars: magnetic fields Stars: individual: HD 232 862 Stars: individual: KU Peg Lèbre, A. Palacios, A. Nascimento Jr., J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. Laverny, P. de Medeiros, José Renan de Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant |
topic_facet |
Stars: abundances Stars: evolution Stars: magnetic fields Stars: individual: HD 232 862 Stars: individual: KU Peg |
description |
Aims. We report the detection of an unusually high lithium content in HD 232 862, a field giant classified as a G8II star, and hostinga magnetic field. Methods. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we collected high resolution and high signalto-noise spectra of three giants: HD 232 862, KU Peg and HD 21 018. From spectral synthesis we inferred stellar parameters and measured lithium abundances that we compared to predictions from evolutionary models. We also analysed Stokes V signatures, looking for a magnetic field on these giants. Results. HD 232 862, presents a very high abundance of lithium (ALi = 2.45 ± 0.25 dex), far in excess of the theoretically value expected at this spectral type and for this luminosity class (i.e., G8II). The evolutionary stage of HD 232 862 was determined, and it suggests a mass in the lower part of the [1.0 M, 3.5 M] mass interval, likely 1.5–2.0 M, at the bottom of the red giant branch. Also, a time variable Stokes V signature was detected in the data of HD 232 862 and KU Peg, pointing to the presence of a magnetic field at the surface of these two rapidly rotating active stars. |
format |
Article in Journal/Newspaper |
author |
Lèbre, A. Palacios, A. Nascimento Jr., J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. Laverny, P. de Medeiros, José Renan de |
author_facet |
Lèbre, A. Palacios, A. Nascimento Jr., J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. Laverny, P. de Medeiros, José Renan de |
author_sort |
Lèbre, A. |
title |
Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant |
title_short |
Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant |
title_full |
Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant |
title_fullStr |
Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant |
title_full_unstemmed |
Lithium and magnetic fields in giant stars: HD 232 862: a magnetic and lithium-rich giant |
title_sort |
lithium and magnetic fields in giant stars: hd 232 862: a magnetic and lithium-rich giant |
publisher |
Astronomy & Astrophysics |
publishDate |
2009 |
url |
https://repositorio.ufrn.br/jspui/handle/123456789/28994 https://doi.org/10.1051/0004-6361/200912038 |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
MEDEIROS, José Renan de et al. Lithium and magnetic fields in giant stars. Astronomy & Astrophysics (Berlin. Print), v. 504, p. 1011-1019, 2009. ISSN 1432-0746 versão online. DOI https://doi.org/10.1051/0004-6361/200912038. Disponível: https://www.aanda.org/articles/aa/abs/2009/36/aa12038-09/aa12038-09.html. Acesso em: 18 maio 2020. Reproduzido com permissão da Astronomy & Astrophysics, © ESO. 0004-6361 (print), 1432-0746 (online) https://repositorio.ufrn.br/jspui/handle/123456789/28994 doi:10.1051/0004-6361/200912038 |
op_doi |
https://doi.org/10.1051/0004-6361/200912038 |
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Astronomy & Astrophysics |
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504 |
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3 |
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1011 |
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1019 |
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