NOAO >   Observing Info >   Approved Programs >   2018A-0098

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Program Information for 2018A-0098


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

CoI: Tara Esplin, U. of Arizona

Title: Toward a Complete Census of Stars in Upper Scorpius

Abstract: The Upper Scorpius OB association contains the largest population of stars and brown dwarfs (likely $sim$2200) among the nearest and youngest clusters and associations ($taulesssim10$~Myr, $dlesssim150$~pc). As a result, it offers the best available statistical constraints on a variety of properties of young stars and brown dwarfs (e.g., IMF, binary fraction, disk fraction). The recent data releases from {it Gaia} and Pan-STARRS1 combined with previous data from 2MASS, UKIDSS, and {it WISE} have now made it possible to perform a thorough census of the members of Upper Sco. We have used proper motions and color-magnitude diagrams measured with those databases to identify candidate members of the association down to $sim$0.005-0.01~$M_odot$. We propose to obtain COSMOS spectra of $sim$250 of the candidates at stellar masses to confirm their youth (and hence membership) and to measure their spectral types. (We are submitting proposals to Gemini, the IRTF, and Steward Observatory for spectroscopy of the remaining stellar and substellar candidates.)

Program Type: Standard/Galactic

Scheduled Nights:
Run 1 (2018A):  CT-4m/COSMOS -- 6n on May 26 - May 31 2018


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 >   2018A-0098

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