Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A catalog of wide binary and multiple systems of bright stars from
  Gaia-DR2 and the Virtual Observatory   Binary and multiple stars have long provided an effective empirical method of
testing stellar formation and evolution theories. In particular, the existence
of wide binary systems (separations $>$20,000 au) is particularly challenging
to binary formation models as their physical separations are beyond the typical
size of a collapsing cloud core ($\sim$5,000$-$10,000 au). We mined the
recently published Gaia-DR2 catalog to identify bright comoving systems in the
five-dimensional space (sky position, parallax, and proper motion). We
identified 3,741 comoving binary and multiple stellar candidate systems, out of
which 575 have compatible RVs for all the members of the system. The candidate
systems have separations between $\sim$400 and 500,000 au. We used the analysis
tools of the Virtual Observatory to characterize the comoving system members
and to assess their reliability. The comparison with previous comoving systems
catalogs obtained from TGAS showed that these catalogs contain a large number
of false systems. In addition, we were not able to confirm the ultra-wide
binary population presented in these catalogs. The robustness of our
methodology is demonstrated by the identification of well known comoving star
clusters and by the low contamination rate for comoving binary systems with
projected physical separations $<$50,000 au. These last constitute a reliable
sample for further studies. The catalog is available online at the Spanish
Virtual Observatory portal
(http://svo2.cab.inta-csic.es/vocats/v2/comovingGaiaDR2/).

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The categories of this paper are: bayes-an
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The categories of this paper are: atom-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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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: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: nucl-th
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The categories of this paper are: eess
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The categories of this paper are: cmp-lg
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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: hep-ex
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con