Astronomy and Astrophysics – Astronomy
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832505b&link_type=abstract
American Astronomical Society, AAS Meeting #218, #325.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The Folded-port Infrared Echellette (FIRE) spectrograph has recently been commissioned on 6.5m Baade Telescope, enabling high-throughput, low- and moderate-resolution spectroscopy of faint infrared sources. As part of science verification observations, we have observed a sample of 35 mid- and late-type T dwarfs in the southern hemisphere down to J 17 at a resolution of 6000 (Δv = 50 km/s), spanning the full 0.85-2.4 micron near-infrared window. We present the results of these observations, including radial velocity measurements based on both spectral fitting and comparison to radial velocity standards, and 3D kinematics for sources with proper motions and parallaxes from the Brown Dwarf Kinematics Program. We also present preliminary rotational velocities down to the pixel-sampling limit (12.5 km/s), made possible by the dozens of molecular transitions resolved by FIRE echelle data. Finally, we present limits on radial velocity variability for two sources suspected of being unresolved (a < 10 AU) spectral binaries.
Bochanski John J.
Burgasser Adam Jonathan
Faherty Jacqueline K.
Simcoe Robert A.
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