NOAO >   Observing Info >   Approved Programs >   2011B-0139

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Proposal Information for 2011B-0139


PI: Jae-Woo Lee, Sejong University, jaewoolee@sejong.ac.kr
Address: Astronomy Department, 98 Gunja, Gwangjin, Seoul 143-747, Korea

CoI: Alistair Walker, CTIO

Title: Ca by Photometry of Southern Globular Clusters: Now or Never

Abstract: Our recent study of Galactic globular clusters using Ca by photometry has shown that many globular clusters have multiple red giant branch populations with distinct calcium abundances. This suggests that these globular clusters, like \omega Cen, are most likely the relics of more massive primeval dwarf galaxies that merged and disrupted to form the proto-Galaxy. We seek to obtain high precision Ca by photometry for 9 southern globular clusters with signatures of multiple stellar populations and 2 dwarf satellite galaxies using the CTIO- 4m/Mosaic II and our own Ca by filters. Our proposed observations will provide unique opportunity to explore fundamental aspects of stellar evolution, the star formation and chemical enrichment histories of globular clusters and dwarf satellite galaxies, and furthermore, the formation of the Milky Way Galaxy in the (Lambda)CDM hierarchical merging paradigm. Since the Mosaic II imager will be retired in mid- 2011B, it will be our last chance to provide invaluable data to the community for southern globular clusters.


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NOAO >   Observing Info >   Approved Programs >   2011B-0139

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