Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star
We report the detection of an unusually high lithium content in HD 232862, a field giant classified as a G8II star, and hosting a magnetic field. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we have collected high resolution and high signal-to-noise spectra of three giants : HD 2...
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ftdatacite:10.48550/arxiv.0906.5539 2023-05-15T18:50:47+02:00 Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star Lèbre, A. Palacios, A. Nascimento, J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. de Laverny, P. De Medeiros, J. R. 2009 https://dx.doi.org/10.48550/arxiv.0906.5539 https://arxiv.org/abs/0906.5539 unknown arXiv https://dx.doi.org/10.1051/0004-6361/200912038 arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences article-journal Article ScholarlyArticle Text 2009 ftdatacite https://doi.org/10.48550/arxiv.0906.5539 https://doi.org/10.1051/0004-6361/200912038 2022-04-01T14:57:50Z We report the detection of an unusually high lithium content in HD 232862, a field giant classified as a G8II star, and hosting a magnetic field. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we have collected high resolution and high signal-to-noise spectra of three giants : HD 232862, KU Peg and HD 21018. From spectral synthesis we have inferred stellar parameters and measured lithium abundances that we have compared to predictions from evolutionary models. We have also analysed Stokes V signatures, looking for a magnetic field on these giants. HD 232862, 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 232862 has been precised, and it suggests a mass in the lower part of the [1.0 Msun 3.5 Msun ] mass interval, likely 1.5 to 2.0 solar mass, at the bottom of the Red Giant Branch. Besides, a time variable Stokes V signature has been detected in the data of HD 232862 and KU Peg, pointing to the presence of a magnetic field at the surface of these two rapidly rotating active stars. : 11 pages, 9 figures accepted by Astronomy and Astrophysics Text narval narval DataCite Metadata Store (German National Library of Science and Technology) |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
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Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences Lèbre, A. Palacios, A. Nascimento, J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. de Laverny, P. De Medeiros, J. R. Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star |
topic_facet |
Solar and Stellar Astrophysics astro-ph.SR FOS Physical sciences |
description |
We report the detection of an unusually high lithium content in HD 232862, a field giant classified as a G8II star, and hosting a magnetic field. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we have collected high resolution and high signal-to-noise spectra of three giants : HD 232862, KU Peg and HD 21018. From spectral synthesis we have inferred stellar parameters and measured lithium abundances that we have compared to predictions from evolutionary models. We have also analysed Stokes V signatures, looking for a magnetic field on these giants. HD 232862, 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 232862 has been precised, and it suggests a mass in the lower part of the [1.0 Msun 3.5 Msun ] mass interval, likely 1.5 to 2.0 solar mass, at the bottom of the Red Giant Branch. Besides, a time variable Stokes V signature has been detected in the data of HD 232862 and KU Peg, pointing to the presence of a magnetic field at the surface of these two rapidly rotating active stars. : 11 pages, 9 figures accepted by Astronomy and Astrophysics |
format |
Text |
author |
Lèbre, A. Palacios, A. Nascimento, J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. de Laverny, P. De Medeiros, J. R. |
author_facet |
Lèbre, A. Palacios, A. Nascimento, J. D. do Konstantinova-Antova, R. Kolev, D. Aurière, M. de Laverny, P. De Medeiros, J. R. |
author_sort |
Lèbre, A. |
title |
Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star |
title_short |
Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star |
title_full |
Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star |
title_fullStr |
Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star |
title_full_unstemmed |
Lithium and magnetic fields in giants. HD 232862 : a magnetic and lithium-rich giant star |
title_sort |
lithium and magnetic fields in giants. hd 232862 : a magnetic and lithium-rich giant star |
publisher |
arXiv |
publishDate |
2009 |
url |
https://dx.doi.org/10.48550/arxiv.0906.5539 https://arxiv.org/abs/0906.5539 |
genre |
narval narval |
genre_facet |
narval narval |
op_relation |
https://dx.doi.org/10.1051/0004-6361/200912038 |
op_rights |
arXiv.org perpetual, non-exclusive license http://arxiv.org/licenses/nonexclusive-distrib/1.0/ |
op_doi |
https://doi.org/10.48550/arxiv.0906.5539 https://doi.org/10.1051/0004-6361/200912038 |
_version_ |
1766244541771284480 |