Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Identification of the TW Hya Association member 2M1235$-$39: a tertiary
  component of the HR 4796 system   The association of the late-type star 2MASS J12354893-3950245 (2M1235-39)
with a bright X-ray source detected serendipitously by ROSAT and XMM-Newton,
combined with its proximity to the well-studied (A+M binary) system HR 4796,
suggests this star is a member of the TW Hya Association (TWA). To test this
hypothesis, we used optical spectroscopy to establish the Li and H-alpha line
strengths and spectral type of 2M1235-39, and determined its proper motion via
optical imaging. The Li absorption and H-alpha emission line strengths of
2M1235-39, its near-IR and X-ray fluxes, and its proper motion all indicate
that 2M1235-39 is a TWA member. Most likely this star is a wide (13,500 AU)
separation, low-mass (M4.5), tertiary component of the HR 4796 system.

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The categories of this paper are: econ
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The categories of this paper are: dg-ga
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The categories of this paper are: supr-con
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The categories of this paper are: funct-an
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The categories of this paper are: alg-geom
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The categories of this paper are: stat
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The categories of this paper are: chao-dyn
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The categories of this paper are: physics
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: q-alg
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The categories of this paper are: cs
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The categories of this paper are: patt-sol