Blue straggler stars beyond the Milky Way: a non-segregated population
  in the Large Magellanic Cloud cluster NGC 2213
  Using the high-resolution observations obtained by the Hubble Space
Telescope, we analyzed the blue straggler stars (BSSs) in the Large Magellanic
Cloud cluster NGC 2213. We found that the radial distribution of BSSs is
consistent with that of the normal giant stars in NGC 2213, showing no evidence
of mass segregation. However, an analytic calculation carried out for these
BSSs shows that they are already dynamically old, because the estimated
half-mass relaxation time for these BSSs is significantly shorter than the
isochronal age of the cluster. We also performed direct N-body simulations for
a NGC 2213-like cluster to understand the dynamical processes that lead to this
none-segregated radial distribution of BSSs. Our numerical simulation shows
that the presence of black hole subsystems inside the cluster centre can
significantly affect the dynamical evolution of BSSs. The combined effects of
the delayed segregation, binary disruption and exchange interactions of BSS
progenitor binaries may result in this none-segregated radial distribution of
BSSs in NGC 2213.
