Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radial-velocity survey of members and candidate members of the TW Hydrae
  association   We report our spectroscopic observations of stars belonging to the young
nearby group known as the TW Hydrae association, as well as of a number of
potential members of the association identified in kinematic and X-ray surveys.
Multiple radial velocity measurements were obtained for each object, several of
which turn out to be multiple systems. Orbital solutions are presented for 3
double-lined binaries, one single-lined binary, and a double-lined triple
system, all with short periods. Effective temperatures and projected rotational
velocities are presented for each visible object. None of the candidate members
of the association in our sample is confirmed as a true member. The large
fraction of close binaries among the candidate members has to do with their
selection based on X-ray emission from ROSAT, which tends to favor the
inclusion of tidally-locked systems that are active but not necessarily young.

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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-ex
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The categories of this paper are: acc-phys
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The categories of this paper are: bayes-an
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The categories of this paper are: q-fin
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The categories of this paper are: eess
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The categories of this paper are: mtrl-th
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The categories of this paper are: cond-mat
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The categories of this paper are: atom-ph
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The categories of this paper are: math-ph
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The categories of this paper are: alg-geom