Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: IRAS 01202+6133 : A Possible Case of Protostellar Collapse Triggered by
  a Small HII Region   We present an analysis of HCO+ (J=3-2) and H13CO+ (J=3-2) observations of the
massive (M ~ 20 Msun) submm/IR source IRAS 01202+6133 located on the periphery
of the HII region KR 120 (Sh 2-187). The HCO+ line profile has a classic
blue-asymmetric shape with the optically thin H13CO+ line peaking at the
position expected if the HCO+ line arises from a combination of self-absorption
and infall motion. We have modified existing analytic radiative transfer models
to allow for the fitting of submm/mm line profiles that have both
self-absorption features and optically thin wings and applied these models to
our HCO+ spectrum of IRAS 01202+6133. We conclude that it is a young Class I
YSO with a substantial envelope undergoing slow infall and having some outflow
motions. The young age of the HII region rules out a "collect and collapse"
scenario. While we cannot eliminate the possibility that IRAS 01202+6133 formed
spontaneously at its current location, considering its early evolutionary state
and its proximity to the HII region we think that the formation of IRAS
01202+6133 was triggered by the expansion of KR 120 (Sh 2-187).

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The categories of this paper are: alg-geom
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The categories of this paper are: cs
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The categories of this paper are: plasm-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: comp-gas
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The categories of this paper are: cond-mat
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The categories of this paper are: funct-an
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The categories of this paper are: eess
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The categories of this paper are: gr-qc
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The categories of this paper are: hep-lat
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The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: math
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
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The categories of this paper are: adap-org