Abundances in metal-poor stars. III - Eleven field giants

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Abundance, Giant Stars, Late Stars, Metallicity, Stellar Spectra, Astronomical Catalogs, Barium, Calcium, Galactic Evolution, Iron, Milky Way Galaxy

Scientific paper

The present investigation is concerned with the high dispersion spectra of eleven field giants, covering a metallicity range from -0.4 to -2.5 (Fe abundances). The data provide a basis for comparing the composition of globular clusters and field stars over a wide range in metal abundance. The kinematical and dynamical properties of the stars suggest a halo origin. Two samples of halo stars are compared. It appears that Ca and Ti are overabundant in metal-poor field stars both in globular clusters and in the field halo. However, the globular clusters are systematically richer in these elements than field stars. Ba (and perhaps Na and Mg) seems overdeficient in metal-poor stars in the field halo but not in globular clusters.

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