Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Another forbidden solar oxygen abundance: the [O I] 5577 A line   Context: Recent works with improved model atmospheres, line formation, atomic
and molecular data, and detailed treatment of blends, have resulted in a
significant downward revision of the solar oxygen abundance.
  Aims: Considering the importance of the Sun as an astrophysical standard and
the current conflict of standard solar models using the new solar abundances
with helioseismological observations we have performed a new study of the solar
oxygen abundance based on the forbidden [OI] line at 5577.34 A, not previously
considered.
  Methods: High-resolution (R > 500 000), high signal-to-noise (S/N > 1000)
solar spectra of the [O I] 5577.34 A line have been analyzed employing both
three-dimensional (3D) and a variety of 1D (spatially and temporally averaged
3D, Holweger & Muller, MARCS and Kurucz models with and without convective
overshooting) model atmospheres.
  Results: The oxygen abundance obtained from the [OI] 5577.3 A forbidden line
is almost insensitive to the input model atmosphere and has a mean value of
A(O) = 8.71 +/- 0.02 (\sigma from using the different model atmospheres). The
total error (0.07 dex) is dominated by uncertainties in the log gf value (0.03
dex), apparent line variation (0.04 dex) and uncertainties in the continuum and
line positions (0.05 dex).
  Conclusions: The here derived oxygen abundance is close to the 3D-based
estimates from the two other [OI] lines at 6300 and 6363 A, the permitted OI
lines and vibrational and rotational OH transitions in the infrared. Our study
thus supports a low solar oxygen abundance (A(O) ~ 8.7), independent of the
adopted model atmosphere.

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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: cs
5
The categories of this paper are: gr-qc
31
The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys
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The categories of this paper are: cmp-lg
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The categories of this paper are: nlin
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The categories of this paper are: hep-th
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The categories of this paper are: q-bio
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The categories of this paper are: nucl-ex
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The categories of this paper are: hep-ph
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The categories of this paper are: math
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The categories of this paper are: stat