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The paper presents an analysis of formation mechanism and properties ofspatial distributions of blue stragglers in evolving globular clusters, basedon numerical simulations done with the MOCCA code. First, there are presentedN-body and MOCCA simulations which try to reproduce the simulations presentedby Ferraro (2012). Then, the agreement between N-body and the MOCCA code isshown. Finally, we discuss the formation process of the bimodal distribution.We report that so-called bimodal spatial distribution of blue stragglers is avery transient feature. It is formed for one snapshot in time and it can easilyvanish in the next one. Moreover, we show that the radius of avoidance proposedby Ferraro (2012) goes out of sync with the apparent minimum of the bimodaldistribution after about two half-mass relaxation times. This finding creates areal challenge for the dynamical clock, which uses this radius to determine thedynamical age of globular clusters. Additionally, the paper discusses a fewimportant problems concerning the apparent visibilities of the bimodaldistributions which have to be taken into account while studying the spatialdistributions of blue stragglers.

MOCCA code for star cluster simulations - VI. Bimodal spatial distribution of blue stragglers