Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release

Details Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release Meeting the Cool Neighbors. X. Ultracool Dwarfs from the 2MASS All-Sky Data Release

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aj....136.1290r&link_type=abstract

The Astronomical Journal, Volume 136, Issue 3, pp. 1290-1311 (2008).

Astronomy and Astrophysics

Astronomy

37

Galaxy: Stellar Content, Stars: Low-Mass, Brown Dwarfs, Stars: Luminosity Function, Mass Function

Scientific paper

Using data from the 2 Micron All Sky Survey All-Sky Point Source Catalogue, we have extended our census of nearby ultracool dwarfs to cover the full celestial sphere above Galactic latitude of 15°. Starting with an initial catalog of 2,139,484 sources, we have winnowed the sample to 467 candidate late-type M or L dwarfs within 20 pc of the Sun. Fifty-four of those sources already have spectroscopic observations confirming them as late-type dwarfs. We present optical spectroscopy of 376 of the remaining 413 sources, and identify 44 as ultracool dwarfs with spectroscopic distances less than 20 pc. Twenty-five of the 37 sources that lack optical data have near-infrared spectroscopy. Combining the present sample with our previous results and data from the literature, we catalog 94 L dwarf systems within 20 pc. We discuss the distribution of activity, as measured by Hα emission, in this volume-limited sample. We have coupled the present ultracool catalog with data for stars in the northern 8 pc sample and recent (incomplete) statistics for T dwarfs to provide a snapshot of the current 20 pc census as a function of spectral type.

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