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Title:
Meeting the Cool Neighbors. I. Nearby Stars in the NLTT Catalogue: Defining the Sample
Authors:
Reid, I. Neill; Cruz, K. L.
Affiliation:
AA(Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218; and Department of Physics and Astronomy, University of Pennsylvania, 209 South 33d Street, Philadelphia, PA 19104 ), AB(Department of Physics and Astronomy, University of Pennsylvania, 209 South 33d Street, Philadelphia, PA 19104 )
Publication:
The Astronomical Journal, Volume 123, Issue 5, pp. 2806-2821. (AJ Homepage)
Publication Date:
05/2002
Origin:
UCP
Astronomy Keywords:
Galaxy: Stellar Content, Stars: Late-Type
DOI:
10.1086/339699
Bibliographic Code:
2002AJ....123.2806R

Abstract

We are currently undertaking a program aimed at identifying previously unrecognized late-type dwarfs within 20 pc of the Sun. As a first step, we have cross-referenced Luyten's NLTT proper-motion catalog against the second incremental release of the Two Micron All Sky Survey (2MASS) Point Source Catalog and use optical/infrared colors, derived by combining Luyten's mr estimates with 2MASS data, to identify candidate nearby stars. This paper describes the definition of a reference sample of 1245 stars and presents a compilation of literature data for more than one-third of the sample. Only 274 stars have trigonometric parallax measurements, but we have used data for nearby stars with well-determined trigonometric parallaxes to compute color-magnitude relations in the (MV, V-K), (MV, V-I), and (MI, I-J) planes and use those relations to determine photometric parallaxes for NLTT stars with optical photometry. Based on the 2MASS JHKs data alone, we have identified a further 42 ultracool dwarfs (J-Ks>0.99) and use J-Ks colors to estimate photometric parallaxes. Combining these various techniques, we identify 308 stars with formal distances of less than 20 pc, while a further 46 have distance estimates within 1 σ of our survey limit. Of these 354 stars, 75, including 39 of the ultracool dwarfs, are new to nearby-star catalogs. Two stars with both optical and near-infrared photometry are potential additions to the immediate solar neighborhood, with formal distance estimates of less than 10 pc.

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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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