We present recent results on variable stars in the Carina Dwarf Galaxy based on B,V time series data collected over three consecutive nights with the Wide Field Imager available at the 2.2m ESO/MPI telescope. At present we have already detected and measured a sample of 92 variable stars. Among them 75 are RR Lyrae stars (54 fundamental, 15 first

We discuss the reduction strategy adopted to perform the relative and the absolute calibration of the Wide Field Imager (WFI) available at the 2.2m ESO/MPI telescope and of the Mosaic Camera (MC) available at the 4m CTIO Blanco telescope. To properly constrain the occurrence of deceptive systematic errors in the relative calibration we observed

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Recently a tight correlation between the bulge velocity dispersion and the galaxy circular velocity has been found for a sample of spiral galaxies (Ferrarese 2002). Since bulge velocity dispersion and circular velocity are related to the masses of the central black hole and dark matter halo respectively, the correlation between velocity dispersion