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The Blue Straggler Population of the Globular Cluster M5

descriptionPublicationkeyboard_double_arrow_right Article , Preprint , Other literature type 01 Jul 2007Embargo end date: 01 Jan 2007 Italy Publisher:American Astronomical SocietyJournal:The Astrophysical Journal, volume 663, pages 267-276 (issn: 0004-637X, eissn: 1538-4357,

Authors: Michela Mapelli; Giacomo Beccari; Giacomo Beccari; Barbara Lanzoni; Francesco R. Ferraro; C. Mancini; Emanuele Dalessandro; +2 Authors

doi: 10.1086/518592 , 10.48550/arxiv.0704.0139

arXiv: http://arxiv.org/abs/0704.0139

handle: 11577/3291857 , 11585/47553

The Blue Straggler Population of the Globular Cluster M5

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Abstract

By combining high-resolution HST and wide-field ground based observations, in ultraviolet and optical bands, we study the Blue Stragglers 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, 47Tucanae, NGC6752). As for these clusters, dynamical simulations suggest that, while the majority of BSS in M5 could be originated by stellar collisions, a significant fraction (20-40%) of BSS 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.

ApJ accepted

Country

Italy

Related Organizations

University of Florence
Italy
University of Padua
Italy
Alma Mater Studiorum University of Bologna
Italy
Università degli studi di Salerno
Italy
Pennsylvania State University
United States

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Keywords

binaries: general — blue stragglers — globular clusters: individual (M5) — stars: evolution, Astrophysics (astro-ph), FOS: Physical sciences, Binaries: general; Blue stragglers; Globular clusters: individual (M5); Stars: evolution; Astronomy and Astrophysics; Space and Planetary Science, Astrophysics

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Blue straggler population of globular cluster M5
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