NOAO >   Observing Info >   Approved Programs >   2011B-0535

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Proposal Information for 2011B-0535


PI: Ana E. Garcia Perez, University of Virginia, aeg4x@virginia.edu
Address: Astronomy Department, Charlottesville, Virginia 22904, US

CoI: K. Cunha, NOAO
CoI: S. Majewski, University of Virginia
CoI: G. Damke, University of Virginia
CoI: V. Smith, NOAO
CoI: D. Nidever, University of Virginia

Title: Chemical Abundance Tagging of Candidate \omega Cen Giant Stars in Tidal-Streams

Abstract: The massive and luminous globular cluster \omega Cen displays evidence of a vigorous and complex star formation history, along with a peculiar internal chemical evolution, both of whose extreme natures set \omega Cen apart from all other Milky Way globular clusters. Given its large mass, odd chemical abundance patterns, and a retrograde Galactic orbit, it has been suggested that \omega Cen is the surviving remnant of a small galaxy that was captured into its retrograde orbit by the Milky Way in the distant past. Using low-resolution spectroscopic surveys, our group has identified possible tidal streams associated with \omega Cen. Initial high-resolution spectroscopic abundance analyses have recovered the peculiar chemical signatures unique to \omega Cen within some of these tidal streams, chemically tagging them as originating in \omega Cen's parent galaxy. High-resolution spectroscopy of giants in \omega Cen tidal streams will be carried out here to chemically confirm membership.


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NOAO >   Observing Info >   Approved Programs >   2011B-0535

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