On the infant weight loss of low- to intermediate-mass star clusters

Star clusters are born in a highly compact configuration, typically with radii of less than about 1 pc roughly independently of mass. Since the star-formation efficiency is less than 50 per cent by observation and because the residual gas is removed from the embedded cluster, the cluster must expand. In the process of doing so it only retains a fraction f_st of its stars. To date there are no observational constrains for f_st, although Nbody calculations by Kroupa et al. (2001) suggest it to be about 20-30 per cent for Orion-type clusters. Here we use the data compiled by Testi et al. (1997, 1998, 1999) for clusters around young Ae/Be stars and by de Wit et al. (2004, 2005) around young O stars and the study of de Zeeuw et al. (1999) of OB associations and combine these measurements with the expected number of stars in clusters with primary Ae/Be and O stars, respectively, using the empirical correlation between maximal-stellar-mass and star-cluster mass of Weidner & Kroupa (2006). We find that f_st < 50 per cent with a decrease to higher cluster masses/more-massive primaries. The interpretation would be that cluster formation is very disruptive. It appears that clusters with a birth stellar mass in the range 10 to 10^3 Msun keep at most 50 per cent of their stars