Globular clusters are old compact systems containing up to a about a million of stars. How so many stars form in such a small area still remains unclear. A particular puzzling feature is that effectively all globular cluster appear to harbor more than one stellar population within them.
In this paper we propose that a first generation of massive stars polluted their lower mass sisters while they were still fully convective PMS stars. While details still need to be worked out, a very attractive feature of this scenario is that it provides a solution for the long standing mass budget problem.
“Early Disc Accretion as the Origin of Abundance Anomalies in Globular Clusters“, by Bastian, Lamers, de Mink, Longmore, Goodwin & Gieles, 2013, MNRAS in press.