Involved people at OAB: Bellazzini, Cacciari, Clementini, Di Fabrizio, Federici.
A search for RR Lyrae variables in Local Group Galaxies is being carried out [Leo I and other dwarf spheroidals in collaboration with Held, Saviane, Momany and Rizzi (OAPd)] as well as for the variables in the globular clusters of M31. 40 V and 20 B Wide field imager frames of the Leo I galaxy have been obtained with the ESO 2.2m telescope in the nights 22-25/4/2000. Data reduction is in progress. A preliminary search of the M31 GCs variables is taking place on HST observational data already available to us and with the intent to apply for further HST observing time
A reanalysis of the properties of the RR Lyraes in the Sgr globular cluster M54 has been undertaken, using multicolor (BVI) photometric data obtained in 1999. Data reduction and analysis are in progress. The search for RR Lyrae variables in metal-rich globular clusters is being extended to the clusters NGC6304 and Arp2.