Synthetic Color-Magnitude Diagrams for omega Centauri and Other Massive Globular Clusters with Multiple Populations

Details Synthetic Color-Magnitude Diagrams for omega Centauri and Other Massive Globular Clusters with Multiple Populations Synthetic Color-Magnitude Diagrams for omega Centauri and Other Massive Globular Clusters with Multiple Populations

2001-10-31

arxiv.org/abs/astro-ph/0110689v1

Astronomy and Astrophysics

Astrophysics

7 pages, 6 figures, newpasp.sty included, to appear in the "Omega Centauri : a unique window into astrophysics" (Cambridge, Au

Scientific paper

We have constructed synthetic color-magnitude diagrams (CMDs) for omega Cen and other massive globular clusters with apparently peculiar CMD morphology. Our population models, which adopt the most up-to-date input physics and parameters, show that the observed CMD of omega Cen can be reproduced by adopting (1) multimodal metallicity distribution function as derived from the observed color distribution of red-giant-branch (RGB) stars, and (2) an internal age-metallicty relation among the populations therein. Similar results were obtained for other massive globular clusters with bimodal horizontal-branches (HBs). In particular, we found that the peculiar CMD morphology (broad RGB, bimodal HB) and properties of RR Lyrae stars observed in NGC 6388 and NGC 6441 can be reproduced by the composite of two distinct populations with mild internal age-metallicity relations. This suggests that these clusters, as well as omega Cen, may represent the relicts of disrupted dwarf galaxies.

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