Abundance of lithium in another sample of halo dwarfs, and in the spectroscopic binary BD -0 4234.
Abstract
The observation of the lithium resonance doublet in 13 other metal poor dwarfs (halo dwarfs) confirms the stability of the lithium abundance in the range 5500° <Teff < 6300° (Spite and Spite, 1982). The value of the lithium abundance of this plateau: log NLi = 2.05, is interpreted as the abundance of this element at the beginning of the life of the Galaxy and thus constrains the cosmological models of the primordial Universe. Lithium is also observed in a cold dwarf, BD -0° 4234. This high velocity binary seems to be old on kinematic and chemical grounds; it shows Hα and H & K in emission and for this reason has been suspected to be an old RS CVn star (Peterson et al., 1980). We suggest the possibility that the observed lithium is formed in the star itself.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 1984
- Bibcode:
- 1984A&A...141...56S
- Keywords:
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- Binary Stars;
- Cosmology;
- Dwarf Stars;
- Lithium;
- Milky Way Galaxy;
- Stellar Composition;
- Abundance;
- Galactic Evolution;
- Late Stars;
- Peculiar Stars;
- Resonance Lines;
- Stellar Spectra;
- Stellar Temperature;
- Astrophysics