Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..266..401g&link_type=abstract
Star clusters: basic galactic building blocks throughout time and space, Proceedings of the International Astronomical Union, IA
Astronomy and Astrophysics
Astronomy
Galaxies: Star Clusters, Galaxies: Dwarf, Galaxies: Nuclei
Scientific paper
We compare nuclear globular clusters (nGCs) in dwarf galaxies and Galactic GCs with extended (hot) horizontal branches (EHB-GCs) to test the suggested external origin of the latter and the conditions under which GC self-enrichment can operate. We show that the present-day escape velocity (vesc) of stellar ejecta to reach the cluster tidal radius compares with those of EHB-GCs. For EHB-GCs, we find a correlation between the present-day vesc and their metallicity as well as (V - I) colour. The similar vesc and (V - I) distribution of nGCs and EHB-GCs implies that nGCs could also have complex stellar populations. The vesc-[Fe/H] relation could reflect the known relation of increasing stellar-wind velocity with metallicity, which in turn explains why more metal-poor clusters typically show more peculiarities in their stellar population than more metal-rich clusters of the same mass.
Baumgardt Holger
Georgiev Iskren Y.
Goudfrooij Paul
Hilker Michael
Puzia Thomas H.
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