In a second scientific project we are interested in the composition and structure of galaxy halos. The halo represent the biggest and oldest component of galaxies. In this project we are mainly interested in the study of the stellar content of halos of nearby galaxies, especially dwarf galaxies. These galaxies are close enough to be resolved into single stars. Due to the use of wide field imaging we are able to perform multicolor observations of a large number of stars within short times. We expect from this observations more exact results about the extent, the density and the stellar content of galaxy halos. A very important diagnostic tool for this study is the color-magnitude diagram. The location of a stellar population in the color-magnitude diagram will give us information about the age and the metalicity of this population. Information about the volume densities we will get from star counts. RR Lyrae variables play an important role for this analysis due to the fact that they represent a truely old stellar population (older than 10 Gyr) and therefore give insights into the structure of the halo just after its formation.

Searches for stellar streams coming from gravitational disrupted dwarf companions of our own galaxy could give informations about the formation of the halo and help to solve the problem of the missing dwarf galaxies which are predicted by the theory and which are not found until now.