Bibcode
Fabbian, D.; Asplund, M.; Carlsson, M.; Kiselman, D.
Bibliographical reference
From Lithium to Uranium: Elemental Tracers of Early Cosmic Evolution, IAU Symposium Proceedings of the international Astronomical Union 228, Held in Paris, France, May 23-27, 2005. edited by Hill, V.; François, P.; Primas, F. Cambridge: Cambridge University Press, 2005., pp.255-256
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2005
Citations
3
Refereed citations
3
Description
We present non-Local Thermodynamic Equilibrium (non-LTE) calculations
for neutral carbon spectral line formation, carried out for a grid of
model atmospheres covering the range of late-type stars. The results of
our detailed calculations suggest that the carbon non-LTE corrections in
these stars are higher than usually adopted, remaining substantial even
at low metallicity. For the most metal-poor stars in the sample of
Akerman et al (2004), the effects are of the order of
ΔlogɛC ≃ -0.35ldots-0.45 (when neglecting
H collisions). Applying our results to those observations, the apparent
[C/O] upturn seen in their LTE analysis is no longer present, thus
revealing no need to invoke contributions from Pop. III stars to the
carbon nucleosynthesis.