Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Self - consistent treatment of dynamics and chemistry in the winds from
  carbon-rich AGB stars. I. Tests of the equilibrium and kinetic chemical codes   The main aim of the paper was performing test of our (chemical and kinetic)
codes, which will be used during self-consistent modelling of dynamics and
chemistry in the winds from C-rich AGB stars. We use the thermodynamical
equilibrium code to test the different databases of dissociation constants. We
also calculate the equilibrium content of the gas using the kinetic code, which
includes the chemical network of neutral--neutral reactions studied by Willacy
& Cherchneff (1998). The influence of reaction rates updated using the UMIST
database for Astrochemistry 2005 (UDFA05), was tested.
  The local thermodynamical equilibrium calculations have shown that the NIST
database reproduces fairly well equilibrium concentrations of Willacy &
Cherchneff (1998), while agreement in case of Tsuji (1973) dissociation
constants is much worse. The most important finding is that the steady state
solution obtained with the kinetic code for reaction network of Willacy &
Cherchneff (1998) is different from the thermodynamical equilibrium solution.
In particular, CN and C2, which are important opacity sources are underabundant
relative to hermodynamical equilibrium, while O-bearing molecules (like SiO,
H2O, and OH) are overabundant. After updating the reaction rates by data from
the UDFA05 database consistency in O-bearing species becomes much better,
however the disagreement in C-bearing species is still present.

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The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
31
The categories of this paper are: ao-sci
33
The categories of this paper are: plasm-ph
32
The categories of this paper are: atom-ph
20
The categories of this paper are: acc-phys
3
The categories of this paper are: physics
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
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The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
13
The categories of this paper are: quant-ph