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We present non-LTE oxygen abundances for a sample of B stars in the Orionassociation. The abundance calculations included non-LTE line formation andused fully blanketed non-LTE model atmospheres. The stellar parameters were thesame as adopted in the previous study by Cunha & Lambert (1994). We find thatthe young Orion stars in this sample of 10 stars are described by a singleoxygen abundance with an average value of A(O)=8.78 and a small dispersion of+/- 0.05 dex, which is of the order of the uncertainties in the analysis. Thisaverage oxygen abundance compares well with the average oxygen abundanceobtained previously in Cunha & Lambert (1994): A(O) = 8.72 +/- 0.13 althoughthis earlier study, based upon non-blanketed model atmospheres in LTE,displayed larger scatter. Small scatter of chemical abundances in Orion B starshad also been found in our previous studies for neon and argon; all based onthe same effective temperature scale. The derived oxygen abundance distributionfor the Orion association compares well with other results for the oxygenabundance in the solar neighborhood.

Chemical Homogeneity in the Orion Association: Oxygen Abundances of B Stars