Accurate and Precise IR Photometry of Omega Centauri

Details Accurate and Precise IR Photometry of Omega Centauri Accurate and Precise IR Photometry of Omega Centauri

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010noao.prop..121w&link_type=abstract

NOAO Proposal ID #2010A-0121

Computer Science

Scientific paper

The most massive globular cluster in the Galaxy, Omega Centauri, has long been known to display a considerable range of metal abundance. More recent observations have shown a far more complex situation, with multiple red giant branches best explained by multiple star formation episodes during the cluster's first few billion years of life, and a split main sequence with the components likely having different helium abundances. A definitive star formation and chemical enrichment history is still lacking. The idea that Omega Centauri is the remnant (nucleus) of a dwarf galaxy accreted billions of years ago by the Milky Way is unproven. Deep and accurate photometry, and spectroscopy, can help disentangle the various evolutionary phrases of this cluster. Deep Near- IR photometry is particularly useful, and here we propose to obtain critical wide-field data that are essential for the interpretation of our deep high-resolution observations.

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