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On the Origin of Subdwarf B Stars and Related Metal-Rich Binaries
Elizabeth M. Green, James Liebert, Rex A. Saffer
Mounting evidence from subdwarf B (sdB) stars in the galactic field and their recently discovered counterparts in old open clusters indicates that at least two thirds of local disk…
A Survey for Faint Stars of Large Proper Motion Using Extra Poss II Plates
David G. Monet, Matthew D. Fisher, James Liebert +3
We have conducted a search for new stars of high proper motion (0.4 arcsec yr) using POSS II fields for which an extra IIIaF (red) plate of good quality exists, along…
New Neighbors from 2MASS: Activity and Kinematics at the Bottom of the Main Sequence
John E. Gizis, David G. Monet, I. Neill Reid +3
We have combined 2MASS and POSS II data in a search for nearby ultracool (later than M6.5) dwarfs with K_s<12. Spectroscopic follow-up observations identify 53 M7 to M9.5 dwarfs an…
An Improved Red Spectrum of the Methane or T-dwarf SDSS 1624+0029: Role of the Alkali Metals
James Liebert, I. Neill Reid, Adam Burrows +3
A Keck~II low resolution spectrum shortward of ome-micron is presented for SDSS 1624+0029, the first field methane or T dwarf discovered in the Sloan Digital Sky Survey. Significan…
Sixty-seven Additional L Dwarfs Discovered by the Two Micron All Sky Survey (2MASS)
J. Davy Kirkpatrick, I. Neill Reid, James Liebert +6
We present JHKs photometry, far red spectra, and spectral classifications for an additional 67 L dwarfs discovered by the Two Micron All Sky Survey. One of the goals of this new se…