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Context. Blue Stragglers Stars (BSSs) are thought to form in globularclusters by two main formation channels: i) mergers induced by stellarcollisions and ii) coalescence or mass-transfer between companions in binarysystems. The detailed study of the BSS properties is therefore crucial forunderstanding the binary evolution mechanisms, and the complex interplaybetween dynamics and stellar evolution in dense stellar systems. Aims. Wepresent the first comparison between the BSS specific frequency and the binaryfraction in the core of a sample of Galactic globular clusters, with the aim ofinvestigating the relative efficiency of the two proposed formation mechanisms.Methods. We derived the frequency of BSSs in the core of thirteen low-densityGalactic globular clusters by using deep ACS@HST observations and investigatedits correlation with the binary fraction and various other cluster parameters.Results. We observed a correlation between the BSS specific frequency and thebinary fraction. The significance of the correlation increases by including afurther dependence on the cluster central velocity dispersion. Conclusions. Weconclude that the unperturbed evolution of primordial binaries could be thedominant BSS formation process, at least in low-density environments.

A Correlation between Blue Straggler and Binary Fractions in the core of Galactic Globular Clusters