  Evolutionary synthesis models for star clusters of various metallicities
including gaseous emission during the lifetime of the ionising stars are used
to model star cluster systems comprising two populations: an old metal-poor
globular clusters (GC) population similar to that of the Milky Way halo and a
second GC population of arbitrary metallicity. We investigate the time
evolution of color distributions and luminosity functions for the two GC
populations in comparison with observations on E/S0 galaxies. We show that
multi-passband data for GC populations give clues to the relative ages and
metallicities of blue and red subpopulations and help constrain formation
scenarios for their parent galaxies.

Astrophysics