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CCD Photometry of the Globular Cluster ω Centauri. I. Metallicity of RR Lyrae Stars from [CLC]Ca[ITAL]by[/ITAL][/CLC] Photometry
We present new measurements of the metallicity of 131 RR Lyrae stars in the globular cluster ω Centauri, using the hk index of the Caby photometric system. The hk method has distinct advantages over ΔS and other techniques in determining the metallicity of RR Lyrae stars and has allowed us …