Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The neon content of nearby B-type stars and its implications for the
  solar model problem   The recent downward revision of the solar photospheric abundances now leads
to severe inconsistencies between the theoretical predictions for the internal
structure of the Sun and the results of helioseismology. There have been claims
that the solar neon abundance may be underestimated and that an increase in
this poorly-known quantity could alleviate (or even completely solve) this
problem. Early-type stars in the solar neighbourhood are well-suited to testing
this hypothesis because they are the only stellar objects whose absolute neon
abundance can be derived from the direct analysis of photospheric lines. Here
we present a fully homogeneous NLTE abundance study of the optical Ne I and Ne
II lines in a sample of 18 nearby, early B-type stars, which suggests log
epsilon(Ne)=7.97+/-0.07 dex (on the scale in which log epsilon[H]=12) for the
present-day neon abundance of the local ISM. Chemical evolution models of the
Galaxy only predict a very small enrichment of the nearby interstellar gas in
neon over the past 4.6 Gyr, implying that our estimate should be representative
of the Sun at birth. Although higher by about 35% than the new recommended
solar abundance, such a value appears insufficient by itself to restore the
past agreement between the solar models and the helioseismological constraints.

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The categories of this paper are: physics
32
The categories of this paper are: atom-ph
19
The categories of this paper are: eess
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ex
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
15
The categories of this paper are: nucl-ex
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The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
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The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph
26
The categories of this paper are: bayes-an