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Rotation and Activity in Mid-M to L Field Dwarfs
We analyze rotation velocities and chromospheric (H?) activity, derived from high-resolution spectra, in a large sample of mid-M to L field dwarfs. The projected rotation velocity is found to… Expand
The t tauri phase down to nearly planetary masses : Echelle spectra of 82 very low mass stars and brown dwarfs
Using the largest high-resolution spectroscopic sample to date of young, very low mass stars and brown dwarfs, we investigate disk accretion in objects ranging from just above the hydrogen-burning… Expand
The Planetary Mass Companion 2MASS 1207–3932B: Temperature, Mass, and Evidence for an Edge-on Disk
We present J-band imaging and H+K-band low-resolution spectroscopy of 2MASS 1207-3932AB, obtained with VLT NACO. For the putative planetary mass secondary, we find J = 20.0 ? 0.2 mag. The HK spectra… Expand
An Effective Temperature Scale for Late-M and L Dwarfs, from Resonance Absorption Lines of Cs I and Rb I
We present Keck HIRES spectra of six late-M dwarfs and 11 L dwarfs. Our goal is to assign effective temperatures to the objects using detailed atmospheric models and fine analysis of the alkali… Expand
RADIUS-DEPENDENT ANGULAR MOMENTUM EVOLUTION IN LOW-MASS STARS. I
Angular momentum evolution in low-mass stars is determined by initial conditions during star formation, stellar structure evolution, and the behavior of stellar magnetic fields. Here we show that the… Expand
A Widely Separated, Highly Occluded Companion to the Nearby Low-mass T Tauri Star TWA 30
We report the discovery of TWA 30B, a wide (~3400?AU), co-moving M dwarf companion to the nearby (~42?pc) young star TWA 30. Companionship is confirmed from their statistically consistent proper… Expand
A Large-Scale Survey of NGC 1333
We observed the clustered star forming complex NGC 1333 with the BIMA and FCRAO telescopes in the transitions HCO+(1-0) and N2H+(1-0) over an 11' × 11' area with resolution ~10'' (0.015 pc). The N2H+… Expand
PROTOPLANETARY DISK MASSES FROM STARS TO BROWN DWARFS
Part of the work by A.S. was funded by the Science Foundation Ireland through grant 10/RFP/AST2780.
The Enigmatic Young, Low-mass Variable TWA 30
TWA 30 is a remarkable young (7 ± 3 Myr), low-mass (0.12 ± 0.04M_⊙), late-type star (M5 ± 1) residing 42 ± 2 pc away from the Sun in the TW Hydrae Association (TWA). It shows strong outflow spectral… Expand
Efficacy of cholinesterase inhibitors in the treatment of neuropsychiatric symptoms and functional impairment in Alzheimer disease: a meta-analysis.
CONTEXT Cholinesterase inhibitors are the primary treatment for the cognitive symptoms of Alzheimer disease (AD). Cholinergic dysfunction is also associated with neuropsychiatric and functional… Expand