The lithium isotope in five F or G dwarfs.
Abstract
Observations of the 6707-A LiI doublet obtained at high resolution and photometric precision are reported for two F dwarfs and three G dwarfs known to have narrow lines and strong 6707-A absorption. Adjacent lines of Ca 1 and Fe 1 are used to predetermine accurately the position and the broadening of theoretical LiI profiles fitted to the observed ones, leaving the abundances of Li-6 and Li-7 as the only adjustable parameters of the calculated profiles. Upper limits R = (Li-6)/(Li-7) less than 0.1 are obtained for four of the stars, while R is less than about 0.1 for Xi UMa A. The total Li/H abundances range from 3 x 10 to the -10th to 10 x 10 to the -10th, with uncertainties probably not exceeding a factor of 2.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- March 1985
- DOI:
- 10.1086/162983
- Bibcode:
- 1985ApJ...290..284H
- Keywords:
-
- Dwarf Stars;
- F Stars;
- G Stars;
- Lithium Isotopes;
- Stellar Composition;
- Abundance;
- Spectral Line Width;
- Spectrum Analysis;
- Stellar Atmospheres;
- Stellar Spectra;
- Astrophysics