Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: On the stability of nonisothermal Bonnor-Ebert spheres. III. The role of
  chemistry in core stabilization   Aims. We investigate the effect of chemistry on the stability of starless
cores against gravitational collapse.
  Methods. We combine chemical and radiative transfer simulations in the
context of a modified Bonnor-Ebert sphere to model the effect of chemistry on
the gas temperature, and study the effect of temperature changes on core
stability.
  Results. We find that chemistry has in general very little effect on the
nondimensional radius $\xi_{\rm out}$ which parametrizes the core stability.
Cores that are initially stable or unstable tend to stay near their initial
states, in terms of stability (i.e., $\xi_{\rm out} \sim$ constant), as the
chemistry develops. This result is independent of the initial conditions. We
can however find solutions where $\xi_{\rm out}$ decreases at late times ($t
\gtrsim 10^6 \, \rm yr$) which correspond to increased stabilization caused by
the chemistry. Even though the core stability is unchanged by the chemistry in
most of the models considered here, we cannot rule out the possibility that a
core can evolve from an unstable to a stable state owing to chemical evolution.
The reverse case, where an initially stable core becomes ultimately unstable,
seems highly unlikely.
  Conclusions. Our results indicate that chemistry should be properly accounted
for in studies of star-forming regions, and that further investigations of core
stability especially with hydrodynamical models are warranted.

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The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
13
The categories of this paper are: quant-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
33
The categories of this paper are: plasm-ph
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
31
The categories of this paper are: ao-sci
18
The categories of this paper are: econ
24
The categories of this paper are: dg-ga
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph