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Using the high-resolution observations obtained by the Hubble SpaceTelescope, we analyzed the blue straggler stars (BSSs) in the Large MagellanicCloud cluster NGC 2213. We found that the radial distribution of BSSs isconsistent with that of the normal giant stars in NGC 2213, showing no evidenceof mass segregation. However, an analytic calculation carried out for theseBSSs shows that they are already dynamically old, because the estimatedhalf-mass relaxation time for these BSSs is significantly shorter than theisochronal age of the cluster. We also performed direct N-body simulations fora NGC 2213-like cluster to understand the dynamical processes that lead to thisnone-segregated radial distribution of BSSs. Our numerical simulation showsthat the presence of black hole subsystems inside the cluster centre cansignificantly affect the dynamical evolution of BSSs. The combined effects ofthe delayed segregation, binary disruption and exchange interactions of BSSprogenitor binaries may result in this none-segregated radial distribution ofBSSs in NGC 2213.

Blue straggler stars beyond the Milky Way: a non-segregated population in the Large Magellanic Cloud cluster NGC 2213