SIMBAD references

2008AJ....136.1290R - Astron. J., 136, 1290-1311 (2008/September-0)

Meeting the cool neighbors. X. Ultracool dwarfs from the 2MASS all-sky data release.

REID N.I., CRUZ K.L., KIRKPATRICK J.D., ALLEN P.R., MUNGALL F., LIEBERT J., LOWRANCE P. and SWEET A.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Galaxy: stellar content - stars: low-mass, brown dwarfs - stars: luminosity function, mass function

VizieR on-line data: <Available at CDS (J/AJ/136/1290): table2.dat table3.dat table4.dat table5.dat table6.dat table7.dat table8.dat table9.dat refs.dat>

Errata: erratum vol. 136, p. 2222 (2008)

Simbad objects: 469

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