Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A revision of the vdB 130 cluster stellar content based on GAIA DR2
  Data. Interstellar extinction toward the Cyg OB1 supershell   Two star-forming regions are studied: the young embedded open cluster vdB 130
and the protocluster neighbourhood observed in the head and tail of the
cometary molecular cloud located in the wall of the expanding supershell
surrounding the Cyg OB1 association. The GAIA DR2 catalogue is employed to
verify the stellar composition of the vdB 130 cluster whose members were
earlier selected using the UCAC4 catalogue. The new sample of vdB 130 members
contains 68 stars with close proper motions (within 1 mas yr$^{-1}$) and close
trigonometric parallaxes (ranging from 0.50 to 0.70 mas). The relative parallax
error is shown to increase with distance to objects and depend on their
magnitude. At a distance of 1.5-2 kpc it is of about 3-7 per cent and 20-30 per
cent for bright and faint stars, respectively. The cluster is not older than
~10 Myr. New spectroscopic and photometric observations carried out on Russian
telescopes are combined with GAIA DR2 to search for optical components in the
protocluster region - a new starburst. An analysis of 20 stars in the vicinity
of the protocluster revealed no concentration of either proper motions or
parallaxes. According to spectroscopic, photometric, and trigonometric
estimates, the distances to these stars range from 0.4 to 2.5 kpc, and colour
excess is shown to increase with a distance D (kpc) in accordance with the law:
$E(B-V)\simeq 0.6\times D$ mag.

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The categories of this paper are: math
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The categories of this paper are: funct-an
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The categories of this paper are: math-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: quant-ph
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The categories of this paper are: stat
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The categories of this paper are: hep-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: supr-con
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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: patt-sol
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The categories of this paper are: nlin
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The categories of this paper are: solv-int