Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Solar Neighborhood XXXVIII. Results from the CTIO/SMARTS 0.9m:
  Trigonometric Parallaxes for 151 Nearby M Dwarf Systems   We present 160 new trigonometric parallaxes for 151 M dwarf systems from the
REsearch Consortium On Nearby Stars (RECONS) group's long-term
astrometry/photometry program at the CTIO/SMARTS 0.9m telescope. Most systems
(124 or 82%) are found to lie within 25 pc. The stars have 119 mas/yr < mu <
828 mas/yr and 3.85 < (V-K) < 8.47. Among these are 58 systems from the
SuperCOSMOS-RECONS (SCR) search, discovered via our proper motion trawls of the
SuperCOSMOS digitized archival photographic plates, while the remaining stars
were suspected via photometric distance estimates to lie nearby. Sixteen are
systems that are newly discovered via astrometric perturbations to be binaries,
many of which are ideal for accurate mass determinations due to their proximity
and orbital periods on the order of a decade. A variability analysis of the
stars presented, two-thirds of which are new results, shows six of the stars to
vary by more than 20 mmag. This effort brings the total number of parallaxes
for M dwarf systems measured by RECONS to nearly 500 and increases by 26% the
number of southern M dwarf systems with accurate trigonometric parallaxes
placing them within 25 pc.

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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: mtrl-th
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The categories of this paper are: hep-ph
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The categories of this paper are: hep-th
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The categories of this paper are: supr-con
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The categories of this paper are: alg-geom
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The categories of this paper are: gr-qc
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The categories of this paper are: math-ph
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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: plasm-ph
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The categories of this paper are: cs