The Role of Hydrogen on Mass Loss from Proto-Globular Clusters
  This short report is concerned with the well known and not yet satisfactorily answered problem of the existence of two well distinct typical mass scales of primordial halo objects: solar size objects (halo field stars) and globular cluster size objects (10^5 solar masses and more). A likely possibility is that almost all the gaseous content of the halo fragmented into massive clouds, which, in their turn, recycled part of their gas to the environment in either a quiescent either a violent way.   The modes and quantity of mass loss depends on thermodynamic properties of gas clouds, determined, in a zero-metal environment, mainly by hydrogenic components evolution and influence on the equation of state.   It is logical to expect that, due to the different dynamical and thermodynamical conditions of the recycled gas, another typical fragmenting mass scale is settled. 
R. Capuzzo-Dolcetta (Inst. of Astronomy, University La Sapienza, Roma,   Italy)