Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7902s&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #79.02; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astronomy
Scientific paper
We present an analysis of the activity and kinematics of a volume-limited (20 pc) sample of over 150 M and L dwarfs photometrically selected from the Two Micron All Sky Survey (2MASS). We calculate tangential velocities from new proper motion measurements and spectrophotometric distance estimates. These kinematic data are combined with spectroscopic observations of H_alpha emission to investigate possible age/activity relations for low-mass stars and brown dwarfs. We also use our sample to investigate the variability of ultracool dwarfs. Eleven dwarfs out of 153 show evidence of variability, ranging from small fluctuations to large flare events. We estimate a flare cycle of 5% for late-M dwarfs and 2% for L dwarfs, assuming all dwarfs in each spectral type are equally likely to flare. Data for two flare observations are presented an amazing flare event on the the M7 dwarf 2MASS J1028404-143843 and strong, variable activity on the L1 dwarf 2MASS J10224821+5825453.
Cruz Kelle L.
Schmidt Sarah J.
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