Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-11-06
Astronomy and Astrophysics
Astrophysics
14 pages, 8 figures, newpasp.sty, to appear in the "Omega Centauri: a Unique Window into Astrophysics" (Cambridge, Aug. 2001),
Scientific paper
We present multi-wavelength observations of the northern population of Omega Cen from the main-sequence turn-off to high on the red giant branch. We show that the best information about the metallicity and age of the stars can be gained from combining vby, B-I and V-I colors (in the absence of spectroscopy). We confirm our results for the main-sequence turn-off stars: there is at least a 3 Gyr age spread. We use proper motion studies to confirm cluster membership at and above the level of the horizontal branch, and we show that the age spread is maintained amongst stars from the subgiant branch through the red giants. The available evidence suggests that Omega Cen is the core of a disrupted dwarf galaxy.
Hughes Joanne
van Leeuwen Floor
Wallerstein George
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