NOAO >   Observing Info >   Approved Programs >   2011A-0415

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Proposal Information for 2011A-0415


PI: Kevin Luhman, Penn State University, kluhman@astro.psu.edu
Address: Astronomy Department, 525 Davey Lab, University Park, PA 16802, USA

Title: A Census of the Stellar Population in Upper Scorpius

Abstract: We propose to improve the census of low-mass stars and brown dwarfs (M<0.5 M_\odot) in the Upper Scorpius young association (145 pc, 5 Myr). To do this, we will search for new members of the association by obtaining optical spectra of candidates selected from wide-field optical and near-infrared surveys (2MASS, DENIS, UKIDSS). We will use these spectra to measure spectral types and confirm membership of the targets. A more complete census of Upper Sco will provide a more accurate measurement of its initial mass function. We also will combine our new census with mid-infrared photometry from the WISE mission to measure the disk fraction as a function of mass with better number statistics than was possible from previous pointed observations with \it Spitzer, which could observe only a small fraction of the stellar population.


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 >   2011A-0415

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