The paper presents an analysis of properties of populations of blue stragglers ( BSs ) in evolving globular clusters , based on numerical simulations done with the mocca code for various initial globular clusters conditions .

We find that various populations of BSs strongly depend on the initial semi-major axes distributions .
With a significant number of compact binaries , the number of evolutionary BSs can be also significant .
In turn , for semi-major axes distributions preferring binaries with wider orbits , dynamical BSs are the dominant ones .
Their formation scenario is very distinct : for wide binaries the number of dynamical interactions is significantly larger .
Most interactions are weak and increase only slightly the eccentricities .
However , due to a large number of such interactions , the eccentricities of a number of binaries finally get so large that the stars collide .

We study how larger initial clusters ’ concentrations influence the BSs .
Besides the expected increase of the number of dynamically created BSs ( for denser GCs the probabilities of strong dynamical interactions and collisions are higher ) , we find that the number of the evolutionary BSs is not affected even by very high initial concentrations .
This has a very important implication on observations – it supports the theory that the evolutionary BSs are the result of the unperturbed evolution of the primordial binaries .

In addition , the paper presents the evolution of the ratio between the number of BSs in binaries and as single stars ( R _ { B / S } ) .
For a vast diversity of models , the ratio R _ { B / S } approaches the value \sim 0.4 .
Additionally , we identified two subgroups which differ in the initial semi-major axes distributions .
The first group starts with a high ratio R _ { B / S } , it decreases with time and settles around 0.4 .
The second group starts with lower values of the ratio R _ { B / S } and increases to about the same level 0.4 .
The first group is dominated by the evolutionary BSs originating from the semi-major axes distribution which create some number of compact binaries .
In turn , the second group is dominated by the dynamical ones with the initial semi-major axes distribution preferring the wider binaries .

We find also that the initial eccentricity distributions seems to have a small or no influence on the population of BSs .