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A Flaring L5 Dwarf: The Nature of HαEmission in Very Low Mass (Sub)Stellar Objects
James Liebert, J. Davy Kirkpatrick, K. L. Cruz +4
Time series spectrophotometry of the L5 dwarf 2MASS 01443536-0716142 showed strong Hαemission which declined by nearly 75% in four consecutive exposures. The line was not detected…
The True Incidence of Magnetism among Field White Dwarfs
James Liebert, P. Bergeron, J. B. Holberg
We study the incidence of magnetism in white dwarfs from three large and well-observed samples of hot, cool, and nearby white dwarfs in order to test whether the fraction of magnet…
Evolution of Brown Dwarf Atmospheres: Investigating Physical Parameters from Near-IR Spectra
Nadya Gorlova, Michael R. Meyer, Jim Liebert +1
We obtained near-infrared spectra of a sample of very low mass objects as a function of age in order to investigate the temperature and surface gravity sensitivity of several featu…
Post-T Tauri Stars in the Nearest OB Association
Eric E. Mamajek, Michael R. Meyer, James Liebert
We present results of a spectroscopic survey of X-ray- and proper motion-selected samples of late-type stars in the Lower Cen-Cru (LCC) and Upper Cen-Lup (UCL) subgroups of the nea…
Astrometry and Photometry for Cool Dwarfs and Brown Dwarfs
C. C. Dahn, H. C. Harris, F. J. Vrba +15
Trigonometric parallax determinations are presented for 28 late type dwarfs and brown dwarfs, including eight M dwarfs with spectral types between M7 and M9.5, 17 L dwarfs with spe…
High resolution spectroscopy of ultracool M dwarfs
I. Neill Reid, J. Davy Kirkpatrick, J. Liebert +3
(abridged) We present high-resolution echelle spectroscopy of a photometricaly-selected sample if thirty-nine dwarfs with spectral types between M6.5 and L0.5. Two stars, 2MASSI 02…