  We present preliminary results obtained from the comparison of the specific
frequencies of Blue Straggler Stars (BSS) detected so far in a sample of 26
Galactic globular clusters. The number of BSS seems to increase almost linearly
with increasing the amount of sampled light in loose clusters, while it drops
abruptly for clusters having intermediate-high central densities. In
particular, a simple interpretative scenario where the BSS in loose clusters
are produced from primordial binaries and those detected in high density
globulars are due to star interactions leading to binary formation, merging.
etc. seems compatible with these early results. The possibility that this
observational evidence could be ascribed to systematic biases mostly related to
the increasing difficulty to detect BSS candidates with increasing cluster
concentration, is also discussed.
