PI: Taran Esplin, Pennsylvania State U.,
Address: Astronomy Department, Davey Lab, University Park, Pennsylvania 16802 United States
CoI: Kevin Luhman, Pennsylvania State U.
Title: A Census of the Stellar Population of Upper Scorpius
Abstract: The Upper Scorpius association likely contains the largest population of low-mass stars and brown dwarfs among the nearest and youngest clusters and associations ($taulesssim10$~Myr, $dlesssim150$~pc). Thus, it offers the best available statistical constraints on the IMF and other properties of low-mass objects (e.g., binary fraction, disk fraction). The recent release of the first data from Gaia has provided accurate astrometry down to relatively faint magnitudes for the entire association. By combining those data with astrometry from 2MASS, we have identified a thorough sample of new candidate members based on proper motions. That sample has been further refined using color-magnitude diagrams from 2MASS and other wide-field surveys like DENIS. We propose to use COSMOS spectroscopy to confirm the membership of these candidates and measure their spectral types.
Program Type: Standard/Galactic
Run 1 (2017A): CT-4m/COSMOS -- 5n on Jul 05 - Jul 09 2017
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360