Omega Centauri: The Population Puzzle Goes Deeper

Details Omega Centauri: The Population Puzzle Goes Deeper Omega Centauri: The Population Puzzle Goes Deeper

2004-03-04

arxiv.org/abs/astro-ph/0403112v1

Astrophys.J.605:L125-L128,2004

Astronomy and Astrophysics

Astrophysics

A_fine_piece_of_work: 12 pages, 2 figures, ApJL_ACCEPTED_, 4 March 2004; high resolution version of the paper available at:

Scientific paper

10.1086/420847

We present HST observations that show a bifurcation of colors in the middle main sequence of the globular cluster Omega Centauri. We see this in three different fields, observed with different cameras and filters. We also present high precision photometry of a central ACS field which shows a number of main-sequence turnoffs and subgiant branches. The double main sequence, the multiple turnoffs and subgiant branches, and other population sequences discovered in the past along the red giant branch of this cluster add up to a fascinating but frustrating puzzle. We suggest various explanations, none of them very conclusive.

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