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Infrared OH lines at 1.5 - 1.7 um in the H band were obtained with theNIRSPEC high-resolution spectrograph at the 10m Keck Telescope for a sample ofseven metal-poor stars. Detailed analyses have been carried out, based onoptical high-resolution data obtained with the FEROS spectrograph at ESO.Stellar parameters were derived by adopting infrared flux method effectivetemperatures, trigonometric and/or evolutionary gravities and metallicitiesfrom FeII lines. We obtain that the sample stars with metallicities [Fe/H] <-2.2 show a mean oxygen abundance [O/Fe] ~ 0.54, for a solar oxygen abundanceof epsilon(O) = 8.87, or [O/Fe] ~ 0.64 if epsilon(O) = 8.77 is assumed.Comment: To be published in ApJ 575 (August 10

Keck NIRSPEC Infrared OH Lines: Oxygen Abundances in Metal‐poor Stars down to [Fe/H] = −2.9