Metallicities are derived via the Delta S method for 59 RR Lyrae variables in the Baade's window field of the Galactic nuclear bulge. Both RRab and RRc variables have average Fe/H = -1.0. The metallicity distribution for the whole sample is sharply peaked, with a dispersion in Fe/H of only 0.16 dex, far smaller than suggested by previous studies. The narrow metallicity distribution does not permit the various current estimates of the magnitude of a luminosity/metallicity relation for RR Lyrae stars to be distinguished. It is also found that the metal abundance of the globular cluster NGC 6522 in Baade's window is close to that of the bulge RR Lyraes, which sets the reddening to the Baade window to be E(B - V) = 0.50 + or - 0.05 and the distance to the galactic center to be 8.2 + or - 1 kpc.
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Walker et al. (1991) studied this question.