The Mg–K Anticorrelation in ω Centauri

AAOmega maps the ISM towards ω Centauri

The Stellar Dynamics of ω Centauri

The stellar dynamics of ω Centauri are inferred from the radial velocities of 469 stars measured with CORAVEL (Mayor et al. 1997). Rather than fit the data to a family of models, we generate estimates of all dynamical functions nonparametrically, by direct operation on the data. The cluster is assumed to be oblate and edge-on but mass is not assumed to follow light. The mean motions are consist...

The Evolution of Copper in the Globular Cluster Ω Centauri

Copper abundances are presented for 40 red-giant members of the massive Galactic globular cluster ω Centauri, as well as 15 red-giant members of the globular clusters NGC288, NGC362, NGC3201, NGC6752, and M4 (NGC6121). The spectra are of relatively high spectral-resolution and signal-to-noise. Using these abundances, plus published literature values for field stars, the abundance trends of [Cu/...

Contrasting copper evolution in ω Centauri and the Milky Way

Despite the many studies on stellar nucleosynthesis published so far, the scenario for the production of Cu in stars remains elusive. In particular, it is still debated whether copper originates mostly in massive stars or type Ia supernovae. To answer this question, we compute self-consistent chemical evolution models taking into account the results of updated stellar nucleosynthesis. By contra...

Radial velocities in the globular cluster ω Centauri

We have used the ARGUS multi–object spectrometer at the CTIO 4m Blanco telescope to obtain 2756 radial velocity measurements for 1966 individual stars in the globular cluster ω Centauri brighter than blue photographic magnitude of about 16.5. Of these, 1589 stars are cluster members. A comparison with two independent radial velocity studies, carried out by Suntzeff & Kraft and by Mayor et al., ...