NOAO >   Observing Info >   Approved Programs >   2010B-0093

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Proposal Information for 2010B-0093


PI: Frederick M Walter, Stony Brook University, fwalter@mail.astro.sunysb.edu
Address: Physics Department, Stony Brook, NY 11794-3800, USA

CoI: William Sherry, NOAO/NSO
CoI: Serena Kim, University of Arizona
CoI: Sean Brittain, Clemson University

Title: Spectroscopy of Intermediate Mass Members of the Orion OB1a and b associations

Abstract: OB associations are ideal sites for probing the formation of low mass stars. There has been little systematic study of the low mass stars in the largest nearby OB association, Orion OB1, aside from the Orion Nebula and \sigma Ori clusters. In an attempt to map the mass function and its spatial variation from 40 to below 0.01 M_\odot, we have completed a near-IR (JHK) survey of about 18 square degrees in the Orion OB1a and OB1b associations using the CPAPIR camera on the SMARTS/CTIO 1.5m telescope, supplemented by a VRI survey using the Steward Observatory Bok/90Prime and the KPNO 4m/MOSAIC cameras, as well as deep 4m/NEWFIRM images. The photometry reveals thousands of candidate association members. We request time with HYDRA to obtain spectra of the brighter candidate members (V<19), in order to confirm youth and membership from Li abundances, chromospheric activity, and radial velocities.


National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360



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