Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...237..125s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 237, no. 1, Oct. 1990, p. 125-136.
Astronomy and Astrophysics
Astrophysics
82
A Stars, Chondrites, Solar Atmosphere, Stellar Spectra, Abundance, Carbon, Equilibrium Methods, Main Sequence Stars, Photosphere
Scientific paper
The statistical equilibrium of carbon is investigated for the atmosphere of the sun and for the prototype A star Vega using a model atom with 88 levels and 66 line transitions of C I and C II. A quantitative assessment is made of the magnitude of non-LTE effects in photospheric abundance determinations for the sun and for Vega. In the sun, non-LTE abundance corrections are typically -0.05 dex, so that the solar carbon abundance becomes log N(C) = 8.58 + or - 0.13 on the scale log N(H) = 12, implying that even the most primitive meteorites, the C1 chondrites, are deficient in carbon by a factor of 10. The photospheric abundance of carbon in Vega is log N(C) = 8.34 + or - 0.13, implying a marginal underabundance with respect to the sun. It is concluded that detailed non-LTE calculations are required for the accurate analysis of photospheric C I lines in main sequence stars of intermediate and late spectral type.
Holweger Hartmut
Stuerenburg S.
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