Astron. J., 123, 2806-2821 (2002/May-0)
Meeting the cool neighbors. I. Nearby stars in the NLTT catalogue: defining the sample.
REID I.N. and CRUZ K.L.
Abstract (from CDS):
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.
Galaxy: Stellar Content - Stars: Late-Type
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<Available at CDS (J/AJ/123/2806): table1 table2 table3 table4 table6 table7 refs>
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