High resolution CCD spectra were obtained in the region λλ6290 - 6330 Å containing the [O I] λ6300.3 Å line for a sample of halo giants. Synthetic spectra were computed to derive their oxygen abundances. A mean value [O/Fe] ≅ +0.35 is obtained.
The Impact of Very High S/N Spectroscopy on Stellar Physics
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