THE G-DWARF PROBLEM - A SYNTHETIC APPROACH

Chemical evolution models for the local galactic disk are combined wit h stellar evolutionary tracks to simulate real stellar samples in a Mo nte Carlo-like approach. These synthetical samples enable to study the significance of selection bias in major observational constraints on chemical evolution models: the [O/H] distribution of long-lived stars and the age-[O/H] relation (AOR). It is found that selection effects d o not much alleviate the G-dwarf problem and that there is essentially no selection bias in the AOR. It is difficult, however, to fit both c onstraints by the same simple chemical evolution model.