Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Triggered star formation surrounding Wolf-Rayet star HD 211853   The environment surrounding Wolf-Rayet star HD 211853 is studied in molecular
emission, infrared emission, as well as radio and HI emission. The molecular
ring consists of well-separated cores, which have a volume density of 10$^{3}$
cm$^{-3}$ and kinematic temperature $\sim$20 K. Most of the cores are under
gravitational collapse due to external pressure from the surrounding ionized
gas. From SED modeling towards the young stellar objects (YSOs), sequential
star formation is revealed on a large scale in space spreading from the
Wolf-Rayet star to the molecular ring. A small scale sequential star formation
is revealed towards core A, which harbors a very young star cluster. Triggered
star formations is thus suggested. The presence of PDR, the fragmentation of
the molecular ring, the collapse of the cores, the large scale sequential star
formation indicate the "Collect and Collapse" process functions in this region.
The star forming activities in core A seem to be affected by the
"Radiation-Driven Implosion" (RDI) process.

17
The categories of this paper are: q-fin
33
The categories of this paper are: plasm-ph
26
The categories of this paper are: bayes-an
23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th
28
The categories of this paper are: alg-geom
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
24
The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph