Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-05-09
Astrophys.J. 644 (2006) L121-L124
Astronomy and Astrophysics
Astrophysics
Accepted for publication in ApJL
Scientific paper
10.1086/505643
We investigate the impact of realistic 3D hydrodynamical model stellar atmospheres on the determination of elemental abundances in the carbon-rich, hyper iron-poor stars HE0107-5240 and HE1327-2326. We derive the chemical compositions of the two stars by means of a detailed 3D analysis of spectral lines under the assumption of local thermodynamic equilibrium (LTE). The lower temperatures of the line-forming regions of the hydrodynamical models cause changes in the predicted spectral line strengths. In particular we find the 3D abundances of C, N, and O to be lower by ~ -0.8 dex (or more) than estimated from a 1D analysis. The 3D abundances of iron-peak elements are also decreased but by smaller factors (~ -0.2 dex). We caution however that the neglected non-LTE effects might actually be substantial for these metals. We finally discuss possible implications for studies of early Galactic chemical evolution.
Asplund Martin
Collet Remo
Trampedach Regner
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