NOAO >   Observing Info >   Approved Programs >   2011A-0425

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Proposal Information for 2011A-0425


PI: Ryan Leaman, University of Victoria, rleaman@uvic.ca
Address: Physics Department, PO Box 3055, STN CSC, Victoria, B. C. V8W 3P6, Canada

CoI: Joanne Hughes, Seattle University
CoI: Andrew Cole, University of Tasmania
CoI: Kim Venn, University of Victoria

Title: Mapping the Structure and Metallicity of the RGB Population in the Dwarf Irregular NGC 6822

Abstract: In this proposal we request Washington + DDO51 photometry to select out and map the RGB population in the massive dIrr NGC 6822. Characterizing the spatial structure of stellar halos in dwarf galaxies is important in understanding how hierarchical merging proceeds at lower masses - or if in situ processes dominate the formation and evolution of stellar structure. The Washington photometry will be used to map the RGB population, and in conjunction with the DDO51 filter, will produce a catalog of member RGB stars in this galaxy for the first time. Without this preselection to avoid the heavy foreground contamination, no large scale spectroscopic study of the RGB in NGC 6822 is possible. This photometric proposal represents the first step towards a novel study to compare the chemodynamical evolution of the gaseous, young stars, and evolved stellar components in this polar ring dIrr. The wide field of view of MOSAICII allows for a global mapping of the evolved RGB in NGC 6822 out to large radii, and is \emphcrucial as a preselection tool for further large spectroscopic surveys, which will provide complementary chemodynamic data of the halo.


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NOAO >   Observing Info >   Approved Programs >   2011A-0425

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