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Title:
Meeting the Cool Neighbors. XI. Beyond the NLTT Catalog
Authors:
Reid, I. Neill; Cruz, Kelle L.; Allen, P. R.
Affiliation:
AA(Space Telescope Science Institute, Baltimore, MD 21218, USA ), AB(Department of Astrophysics, American Museum of Natural History, New York, NY 10024, USA ), AC(Department of Astrophysics, Pennsylvania State University, University Park, PA 16801, USA )
Publication:
The Astronomical Journal, Volume 133, Issue 6, pp. 2825-2840. (AJ Homepage)
Publication Date:
06/2007
Origin:
UCP
Astronomy Keywords:
Galaxy: stellar content, solar neighborhood, stars: distances, stars: late-type
DOI:
10.1086/517914
Bibliographic Code:
2007AJ....133.2825R

Abstract

We have combined near-infrared data from the Two Micron All Sky Survey with ancillary optical data to identify previously unrecognized proper-motion stars that have colors and magnitudes consistent with nearby M dwarfs. We present follow-up observations of 392 stars from that sample, including ~200 stars discussed here for the first time. Our distance estimates, based primarily on spectroscopic parallaxes, place 123 stars within 20 pc of the Sun. One hundred and seventy-six stars exhibit Hα emission, and 82 stars have plausible X-ray counterparts from ROSAT observations. The distribution of chromospheric and coronal activity is broadly consistent with data for other nearby late-type stars, with ~30 stars having activity levels comparable to Pleiades M dwarfs. We have identified several M dwarfs that are probably wide ( >1000 AU) companions of F and G stars. We have recomputed the 20 pc luminosity function, adding the 123 new candidates found in the present survey. The revised luminosity function is in closer agreement with the 8 pc data set for stars with MJ>8 but probably remains incomplete at the ~20% level.

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