Journal
ASTRONOMY & ASTROPHYSICS
Volume 504, Issue 3, Pages 1011-1019Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/200912038
Keywords
stars: abundances; stars: evolution; stars: magnetic fields; stars: individual: HD 232 862; stars: individual: KU Peg
Categories
Funding
- French PNPS/INSU-CNRS
- CNPq
- FAPERN
Ask authors/readers for more resources
Aims. We report the detection of an unusually high lithium content in HD 232 862, a field giant classified as a G8II star, and hosting a magnetic field. Methods. With the spectropolarimeters ESPaDOnS at CFHT and NARVAL at TBL, we collected high resolution and high signal-to-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 (A(Li) = 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-circle dot, 3.5 M-circle dot] mass interval, likely 1.5-2.0 M-circle dot, 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.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available