NOAO >   Observing Info >   Approved Programs >   2010A-0121

Small NOAO Logo

Proposal Information for 2010A-0121


PI: Alistair Walker, NOAO/CTIO, awalker@ctio.noao.edu
Address: -, Casilla 603, La Serena, Chile

CoI: Giuseppe Bono, University of Rome Tor Vergata
CoI: Annalisa Calamida, ESO
CoI: Peter Stetson, NRC/DAO

Title: Accurate and Precise IR Photometry of Omega Centauri

Abstract: 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.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



NOAO >   Observing Info >   Approved Programs >   2010A-0121

noaoprop-help@noao.edu

Small NOAO Logo