TY - JOUR
T1 - The blue straggler population of the globular cluster M5
AU - Lanzoni, B.
AU - Dalessandro, E.
AU - Ferraro, F. R.
AU - Mancini, C.
AU - Beccari, G.
AU - Rood, R. T.
AU - Mapelli, M.
AU - Sigurdsson, S.
PY - 2007/7/1
Y1 - 2007/7/1
N2 - By combining high-resolution HSTand wide-field ground-based observations, in ultraviolet and optical bands, we study the blue straggler star (BSS) population of the galactic globular cluster M5 (NGC 5904) from its very central regions up to its periphery. The BSS distribution is highly peaked in the cluster center, decreases at intermediate radii and rises again outward. Such a bimodal distribution is similar to those previously observed in other globular clusters (M3, 47 Tucanae, NGC 6752). As for these clusters, dynamical simulations suggest that, while the majority of BSSs in M5 could be originated by stellar collisions, a significant fraction (20%-40%) of BSSs generated by mass transfer processes in primordial binaries is required to reproduce the observed radial distribution. A candidate BSS has been detected beyond the cluster tidal radius. If confirmed, this could represent an interesting case of an "evaporating" BSS.
AB - By combining high-resolution HSTand wide-field ground-based observations, in ultraviolet and optical bands, we study the blue straggler star (BSS) population of the galactic globular cluster M5 (NGC 5904) from its very central regions up to its periphery. The BSS distribution is highly peaked in the cluster center, decreases at intermediate radii and rises again outward. Such a bimodal distribution is similar to those previously observed in other globular clusters (M3, 47 Tucanae, NGC 6752). As for these clusters, dynamical simulations suggest that, while the majority of BSSs in M5 could be originated by stellar collisions, a significant fraction (20%-40%) of BSSs generated by mass transfer processes in primordial binaries is required to reproduce the observed radial distribution. A candidate BSS has been detected beyond the cluster tidal radius. If confirmed, this could represent an interesting case of an "evaporating" BSS.
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U2 - 10.1086/518592
DO - 10.1086/518592
M3 - Article
AN - SCOPUS:34547172609
SN - 0004-637X
VL - 663
SP - 267
EP - 276
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 1 I
ER -