Events at Physics
or interacting massive binaries. This interpretation has several serious problems: a mass budget problem, a gas-retention problem, <br><br>
an IMF problem and a Li-problem. Last year we proposed a new model in which the observations are explained by one single star forming event with the low mass stars,polluted by ejecta from the massive stars of the same event(Bastian et al. 2013, MNRAS 436, 2398)This model overcomes some of the serious shortcomings of the multiple generation models. I will discuss this model and the results of recent studies that support it.