Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the Transition from AGB Stars to Planetaries: The Spherical Case   We discuss the basic physical model and the relevant processes responsible
for creating and shaping planetary nebulae out of a cool AGB wind envelope. We
show that a hydrodynamical treatment along the upper AGB leads quite naturally
to more realistic starting configurations for planetaries with density slopes
steeper than r^{-2}. Taking into account photoionization and wind interaction
in a realistic manner, the hydrodynamics of post-AGB wind envelopes leads to
density structures and velocity fields in close resemblance to observations of
spherical or elliptical planetary nebulae.

22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
27
The categories of this paper are: comp-gas
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org