Poster Abstracts

Name/Affiliation:  Frederick M Walter (Stony Brook University)

Title:  Sub-Stellar Mass Objects in Orion OB1b

Our moderately-deep near-IR survey of Orion OB1b (the belt of Orion) revealed a large number of candidate substellar mass objects based on the JHK photometry alone. I have obtained followup near-IR spectroscopy of a subset of these candidates. I will present the spectra, and report on spectroscopic gravity indicators present in these spectra. Substellar mass objects at an age of 2 million years resemble M6-M7 stars, but are expected to have lower surface gravities and other indicators of youth.