RRAB Variables and Metallicity
  A preliminary analysis of the UBV light curves of RR AB variables revealed that they contain information on the metallicities of these stars. The computed parameters which correlate with metallicity are given in the tables for 99 RR AB stars including 12 variables without previously determined metallicities. 
Z.Kadla (The Main Astronomical Observatory of the Russian Academy of   Sciences at Pulkovo, Saint-Petersburg, Russia)