Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Shaping Planetary Nebulae by Jets   We conduct 2D axisymmetrical hydrodynamical simulations to investigate the
interaction of a collimated fast wind (CFW; wide jets) with a spherical AGB
wind. The code includes radiative cooling. We find that the shape of the
planetary nebula (PN) is sensitive to the exact mass loss history of the AGB
wind, and the opening angle of the CFW. Some typical PN morphologies are
obtained, but many other observed morphologies seem to require more ingredients
than what we assume in our present simulations, e.g., equatorial AGB wind, and
ionization and fast wind during the PN phase. The hot bipolar bubble formed by
the jets is an X-ray source.

12
The categories of this paper are: nucl-th
13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
1
The categories of this paper are: cs
2
The categories of this paper are: math
28
The categories of this paper are: alg-geom
8
The categories of this paper are: hep-ex
16
The categories of this paper are: stat
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
30
The categories of this paper are: q-alg
3
The categories of this paper are: physics
29
The categories of this paper are: funct-an