The Brown Dwarf Kinematics Project: Radial Velocities of M and L Dwarfs with MagE

Details The Brown Dwarf Kinematics Project: Radial Velocities of M and L Dwarfs with MagE The Brown Dwarf Kinematics Project: Radial Velocities of M and L Dwarfs with MagE

Jan 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21743411l&link_type=abstract

American Astronomical Society, AAS Meeting #217, #434.11; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

Scientific paper

We present preliminarily radial velocities of a sample of late M- and L-type dwarfs obtained with the Magellan Echellette (MagE) spectrograph on Magellan's 6.5m Clay telescope. The sources were chosen to have distances less than 20 parsecs from the Sun, and/or have unusual spectral energy distributions (e.g., subdwarfs, low surface gravity objects). Radial velocities were calculated from the line centers of prominent atomic absorbers (e.g., K I, Na I, Ca I, Cs I, Rb I) and cross-correlation with both SDSS M- and L-dwarf template standards from Bochanski et al. (2005) and MagE spectra of M- and L-dwarfs with measured radial velocities from the literature. We combine these radial velocities with proper motion and parallax measurements to calculate UVW velocities for our dwarf sample. We present preliminary analysis of velocity dispersions for the sample and examine correlations between kinematics and spectral activity, metallicity and age diagnostics. We also report the Galactic orbit of 2MASS J07075327-4900503, an unusually fast-moving dwarf in our sample.

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