Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Outbursting Young Stellar Object PGIR 20dci in the Perseus Arm   We report the discovery of a likely outbursting Class I young stellar object,
associated with the star-forming region NGC 281-W (distance $\sim 2.8$ kpc).
The source is currently seen only at infrared wavelengths, appearing in both
the Palomar Gattini InfraRed ($1.2~\mu$m) and the Near Earth Object Widefield
Infrared Survey Explorer ($3.4$ and $4.6~\mu$m) photometric time-domain
surveys. Recent near-infrared imaging reveals a new, extended scattered light
nebula. Recent near-infrared spectroscopy confirms the similarity of PGIR 20dci
to FU Ori type sources, based on strong molecular absorption in CO, H$_2$O, and
OH, weak absorption in several atomic lines, and a warm wind/outflow as
indicated by a P Cygni profile in the HeI 10830 A line. This is a rare case of
an FU Ori star with a well-measured long term photometric rise before a sharper
outburst, and the second instance of an FU Ori star with a documented two-step
brightening in the mid-infrared.

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The categories of this paper are: dg-ga
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The categories of this paper are: hep-lat
31
The categories of this paper are: ao-sci
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The categories of this paper are: q-alg
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The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: chao-dyn
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The categories of this paper are: funct-an
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The categories of this paper are: nucl-th
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The categories of this paper are: plasm-ph
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The categories of this paper are: hep-th
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The categories of this paper are: stat
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The categories of this paper are: math
3
The categories of this paper are: physics