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Stellar oxygen abundances. I: A resolution to the 7774 Å O I abundance discrepancy

We investigate the discrepancy between [O/Fe] ratios of metal-poor stars derived from the 7774 A O I triplet and [O/Fe] ratios determined from other oxygen lines. We propose a possible resolution to this discrepancy which also eliminates the correlation of [O/Fe] and T eff found in a recent 7774 A O I analysis. The equivalent widths of Abia & Rebolo [ApJ, 347, 186 (1989)] are found to be systematically too high by 25%. Arguments are presented that current temperature estimates for halo stars are 150-200 K too low. Using the guidance of both model atmospheres and other empirical color-T eff relations, we construct new color temperature relations for metal-poor stars. These relations are tied to the temperature scale of Saxner & Hammarback [A&A, 151, 372 (1985)] for metal-rich stars