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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
AJ Keywords:
Galaxy: Stellar Content, Galaxy: 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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Part 1     Part  2     Part  3     Part  4     Part  5     Part  6     Part  7     Part  8     Part  9     Part 10    

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