Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21344228b&link_type=abstract
American Astronomical Society, AAS Meeting #213, #363.03; Bulletin of the American Astronomical Society, Vol. 41, p.323
Astronomy and Astrophysics
Astronomy
Scientific paper
Blue Straggler Stars (BSS) form the most common "anomalous" sequence in Globular Clusters (GC) and are considered powerful tracers of the dynamic state of these stellar systems. In particular the observed BSS radial distribution within each cluster seems to show some imprints of the cluster dynamical history. Here, I present recent results for a sample of GCs, obtained by combining optical and Ultra-Violet (UV) high-resolution HST imaging, wide field ground based data and GALEX photometry. Most of the clusters studied using this observational approach show a bimodal BSS radial distribution, suggesting the co-existence of a collisional population (generated by frequent collisions in the high density cores) together with a sub-population generated by mass-transfer in the periphery, which is only partly segregated. In two cases, OmegaCen and NGC2419, the BSSs show no evidence of mass segregation, suggesting that stellar collisions have played a minor role in forming BSS in these clusters.
Beccari Giacomo
Dalessandro Emanuele
Ferraro Francesco R.
Lanzoni Barbara
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