PI: Frederick M. Walter, Stony Brook University, email@example.com
Address: Physics Department, Stony Brook, NY 11794-3800, USA
CoI: William Sherry, NSO/NOAO
CoI: Serena Kim, University of Arizona
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. The photometry reveals thousands of candidate association members. We request time with HYDRA to obtain spectra of the faintest candidate stellar members (16<V<20), in order to confirm youth and membership from Li abundances, chromospheric activity, and radial velocities. This is a continuation of a program started in the 2010B semester.
National Optical Astronomy Observatory, 950 North Cherry Avenue, P.O. Box 26732, Tucson, Arizona 85726, Phone: (520) 318-8000, Fax: (520) 318-8360