NOAO >   Observing Info >   Approved Programs >   2009A-0211

Small NOAO Logo

Proposal Information for 2009A-0211


PI: Christopher Sneden, University of Texas at Austin, chris@verdi.as.utexas.edu
Address: Astronomy Department, C1400, Austin, TX 78712, USA

CoI: Angela Bragaglia, INAF - Osservatorio Astronomico Bologna
CoI: Eugenio Carretta, INAF - Osservatorio Astronomico Bologna
CoI: Raffaele Gratton, INAF - Osservatorio Astronomico Padova
CoI: Sara Lucatello, INAF - Osservatorio Astronomico Padova

Title: Searching for Abundance Anomalies in the Old, Metal-rich Open Cluster NGC 6791

Abstract: We plan to observe a large number of giant stars in the very massive, very old, and very metal rich open cluster (OC) NGC 6791 using Hydra@WIYN. Besides its extreme properties, this cluster has many peculiarities, among which is the presence of extremely blue horizontal branch stars -- a feature not present in open clusters, but common among globular clusters (GCs). NGC 6791 is an ideal target to investigate the (possible) existence of chemical "anomalies" in OCs such as the Na-O anticorrelation that are found in all GCs. Having concentrated on GCs in past studies, we wish to extend the knowledge of this phenomenon to the OCs, trying to put constraints on the lower mass limit at which it manifests. This will contribute to the understanding of the formation and early evolution of clusters.


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 >   2009A-0211

noaoprop-help@noao.edu

Small NOAO Logo