Oxygen abundances in the atmospheres of a dozen unevolved stars of various metallicities (Fe/H in the closed interval -2.3 -0.3) have been derived. In nearly all cases, the metal-poor stars exhibit an enhanced oxygen triplet at 7700 A. Substantial overabundances of oxygen are indicated for the program stars. This result is discussed in the light of current galactic nucleosynthesis theories.
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Sneden et al. (1979) studied this question.