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Low resolution spectra of 23 stars towards the bulge globular clusters NGC6528 and NGC 6553 are analysed. Radial velocities and atmospheric parametersare derived in order to check their membership in the clusters. Effectivetemperatures were obtained from photometric data for stars with Teff > 3800 K,whereas for cooler stars, they were derived from equivalent widths of TiObands. Calibrations of W(TiO) as a function of stellar parameters based on agrid of synthetic spectra are presented. Metallicities were derived from acomparison of the observed spectra to a grid of synthetic spectra. The samplecomprises evolutionary stages from the Red Giant Branch to the HorizontalBranch, with parameters in the range 3200 <= Teff <= 5000 K and -0.5 <= log g<= 2.4. The mean metallicities obtained for NGC 6528 and NGC 6553 are [Fe/H] ~-0.5 and -0.7, in both cases with [Mg/Fe] = +0.3; assuming the sameoverabundance for the $\alpha$ elements O, Mg, Si, S, Ca and Ti, this gives[Z/Zsolar] = -0.25 and -0.45. Membership verification by means of lowresolution spectra is a crucial step in preparing targets for high resolutionspectroscopy with 8m class telescopes.Comment: Accepted for publication in A&

Membership of 23 stars towards the bulge globular clusters NGC 6528 and NGC 6553