Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21542426s&link_type=abstract
American Astronomical Society, AAS Meeting #215, #424.26; Bulletin of the American Astronomical Society, Vol. 42, p.335
Astronomy and Astrophysics
Astronomy
Scientific paper
We present a sample of 484 L dwarfs from the Sloan Digital Sky Survey (SDSS) spectroscopic database, selected primarily using spectroscopic criteria. Our SDSS L dwarf sample has a bluer median J-Ks color at each spectral type than samples of L dwarfs selected using infrared colors, which reflects a bias towards redder J-Ks in previously known L dwarfs. Distances are estimated using newly derived photometric parallax relations in i-z and i-J, and are combined with radial velocities and proper motions to calculate full space motions. As a single population, L dwarfs do not appear to be kinematically cooler (younger) than M dwarfs. However, our sample is better fit by a two-population model with hot and cold components, consistent with young and old disk populations. We also find that bluer objects have a larger velocity dispersion than redder objects of the same spectral type, indicating that the J-Ks color may be a good tracer of age.
Hawley Suzanne L.
Pineda Sebastian J.
Schmidt Sarah J.
West Andrew A.
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