Multiple populations in Galactic globular clusters: a survey in the Strömgren system

J. Alonso-García, M. Catelan, P. Amigo, C. Cortés, C. A. Kuehn, F. Grundahl, G. López, R. Salinas, H. A. Smith, P. B. Stetson, A. V. Sweigart, A. A. R. Valcarce, M. Zoccali

Published 2013-01-13Version 1

We are coming to believe that stellar populations in globular clusters are not as simple as they were once thought to be. A growing amount of photometric and spectroscopic evidence shows that globular clusters host at least two different stellar populations. In our contribution to these proceedings we present the first results of a survey we are conducting to look for the presence of multiple populations in a significant number of Galactic globular clusters, using the Str\"omgren system. We intend to photometrically separate these populations and characterize their radial distributions and extensions.