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HD 232 862 : a magnetic and lithium-rich giant star

Published online by Cambridge University Press:  23 April 2010

A. Palacios ,
A. Lèbre ,
J. D. do Nascimento Jr ,
R. Konstantinova-Antova ,
D. Kolev ,
M. Aurière ,
P. de Laverny  and
J. R. de Medeiros
A. Palacios
Affiliation:
GRAAL-CNRS/Université Montpellier II, France email: palacios@graal.univ-montp2.fr
A. Lèbre
Affiliation:
GRAAL-CNRS/Université Montpellier II, France email: palacios@graal.univ-montp2.fr
J. D. do Nascimento Jr
Affiliation:
DFTE - Universidade Federal do Rio Grande do Norte, Natal, Brazil
R. Konstantinova-Antova
Affiliation:
Institute of Astronomy, Bulgarian Academy of Sciences, Sofia, Bulgaria
D. Kolev
Affiliation:
Institute of Astronomy, Bulgarian Academy of Sciences, Sofia, Bulgaria
M. Aurière
Affiliation:
LATT - Observatoire Midi-Pyrénées, Toulouse, France
P. de Laverny
Affiliation:
Cassiopée, Observatoire de la Côte d'Azur, Nice, France
J. R. de Medeiros
Affiliation:
DFTE - Universidade Federal do Rio Grande do Norte, Natal, Brazil
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Abstract

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Using spectropolarimetric data acquired with the ESPaDOnS and NARVAL instruments at CFHT and at TBL, we present a detailed spectral synthesis analysis of HD 232 862, a field giant classified as a G8II star hosting a magnetic field. This star is the first lithium-rich field giant hosting a magnetic field. Stellar evolution models suggest that HD 232 862 should be a 1.5 to 2.0 M⊙ star at the bottom of the red giant branch. Its unsually high lithium content (A(Li) = 2.45 ± 0.25 dex) is even more puzzling and challenges our understanding of the evolution of this star.

Keywords

Stars: spectroscopyspectropolarimetryabundancesevolutionmagnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S268: Light Elements in the Universe , November 2009 , pp. 347 - 348
Copyright
Copyright © International Astronomical Union 2010

References

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