Probing the LHS Catalog. II. Faint proper-motion stars

被引：58
作者：
Reid, IN
Gizis, JE
机构：
[1] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[2] Univ Delaware, Dept Phys & Astron, Newark, DE 19716 USA
来源：
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF THE PACIFIC | 2005年 / 117卷 / 833期
关键词：
D O I：
10.1086/430462
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
We present low-resolution spectroscopic observations of faint proper-motion stars from the LHS Catalogue, concentrating on stars with m(r) > 16.5 and mu > 0.'' 5 yr(-1). The present paper includes observations and spectral classifications for 294 M dwarfs, M subdwarfs ( sdM), and extreme M subdwarfs (esdM). We also identify white dwarfs among the faintest LHS stars. We have cross-referenced this sample against the Two Micron All Sky Survey (2MASS) sources, and list data for the detected objects. We discuss stars of individual interest, as well as the characteristics of the overall sample. As expected, a significant number of the stars in this proper-motion selected sample are halo subdwarfs, including an esdM dwarf, LHS 3481, that is likely to lie within 20 pc of the Sun. None of the subdwarfs show H alpha emission.
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页码：676 / 698
页数：23
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