SIMBAD references

2006ApJ...647.1075S - Astrophys. J., 647, 1075-1092 (2006/August-3)

The age and metallicity relation of ω Centauri.


Abstract (from CDS):

We present a metallicity distribution based on photometry and spectra for 442 ω Centauri cluster members that lie at the main-sequence turnoff region of the color-magnitude diagram. This distribution is similar to that found for the red giant branch. The distribution shows a sharp rise to a mean of [Fe/H]=-1.7 with a long tail to higher metallicities. Ages have then been determined for the stars using theoretical isochrones enabling the construction of an age-metallicity diagram. Interpretation of this diagram is complicated by the correlation of the errors in the metallicities and ages. Nevertheless, after extensive Monte Carlo simulations, we conclude that our data show that the formation of the cluster took place over an extended period of time: the most metal-rich stars in our sample ([Fe/H]~-0.6) are younger by 2-4 Gyr than the most metal-poor population.

Abstract Copyright:

Journal keyword(s): Galaxy: Globular Clusters: General - Galaxy: Globular Clusters: Individual: Name: ω Centauri

VizieR on-line data: <Available at CDS (J/ApJ/647/1075): table2.dat table3.dat>

Nomenclature: Tables 2, 3: CL* NGC 5139 SDN NNNNNNN N=442+418.

Status at CDS : All or part of tables of objects will not be ingested in SIMBAD.

Simbad objects: 370

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