The small Blue Straggler star population in the dense Galactic Globular Cluster NGC 6752

Details The small Blue Straggler star population in the dense Galactic Globular Cluster NGC 6752 The small Blue Straggler star population in the dense Galactic Globular Cluster NGC 6752

2004-08-31

arxiv.org/abs/astro-ph/0409001v1

Astrophys.J. 617 (2004) 1296-1306

Astronomy and Astrophysics

Astrophysics

29 pages, 10 figures, in press on ApJ

Scientific paper

10.1086/425492

We have used high resolution WFPC2-HST and wide field ground-based observations to construct a catalog of blue straggler stars (BSS) which spans the entire radial extent of the globular cluster NGC 6752. The BSS sample is the most extensive ever obtained for this cluster. Though NGC 6752 is a high density cluster with a large binary population, we found that its BSS content is surprisingly low: the specific number of BSS is among the lowest ever measured in a cluster. The BSS distribution is highly peaked in the cluster center, shows a rapid decrease at intermediate radii, and finally rises again at larger distances. This distribution closely resembles those observed in M3 and 47Tuc by Ferraro et al. (1993), Ferraro et al. (2003c). To date, BSS surveys covering the central regions with HST and the outer regions with wide field CCD ground-based observations have been performed for only these three clusters. Despite the different dynamical properties, a bimodal radial distribution has been found in each. A detailed comparison of observed BSS luminosity and temperature distributions with theoretical models reveals a population of luminous, hot BSS which is not easily interpreted.

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