Journal
ASTROPHYSICAL JOURNAL
Volume 605, Issue 2, Pages L125-L128Publisher
IOP PUBLISHING LTD
DOI: 10.1086/420847
Keywords
globular clusters : individual (omega Centauri); Hertzsprung-Russell diagram
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We present Hubble Space Telescope 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 Advanced Camera for Surveys 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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