Volume 378, Number 1, October IV 2001
|Page(s)||97 - 101|
|Published online||15 October 2001|
The self-enrichment of galactic halo globular clusters
The mass-metallicity relation
Institute of Astrophysics and Geophysics, University of Liège, avenue de Cointe 5, 4000 Liège, Belgium
2 Institute of Astronomy, Madingley Road, Cambridge CB3 0HA, UK
Corresponding author: G. Parmentier, email@example.com
Accepted: 16 August 2001
We discuss the existence of a mass-metallicity relation among galactic halo globular clusters. The lack of any luminosity-metallicity correlation in globular cluster systems has been used as an argument against self-enrichment models of cluster formation. We show that such a relation is statistically present among the galactic Old Halo globulars. This observational correlation implies that the least massive old clusters are the most metal-rich. This is in contradiction with the idea that, if globular clusters were self-enriched systems, the most metal-rich clusters would also be the most massive ones. We further show that this anti-correlation is as predicted by self-enrichment models.
Key words: Galaxy: evolution / Galaxy: formation / globular clusters: general / Galaxy: halo
© ESO, 2001
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