Table 4
Uncertainty budget for the abundances derived from the EWs in the case of HD 175679.
| σ int | σ Teff | σ log g | σ ξ | σ normalisation | σ total | |
|
|
||||||
| Δ [ Fe/H ] | 0.05 | +0.05 | +0.00 | –0.01 | +0.07 | 0.10 |
| Δ[O i triplet/Fe] | 0.05 | –0.07 | +0.11 | –0.01 | +0.04 | 0.15 |
| Δ[Na/Fe] | 0.03 | –0.02 | –0.02 | +0.01 | –0.01 | 0.05 |
| Δ[Mg/Fe] | 0.07a | –0.04 | –0.03 | –0.01 | –0.01 | 0.09 |
| Δ[Al/Fe] | 0.07 | –0.02 | –0.02 | +0.02 | +0.01 | 0.08 |
| Δ[Si/Fe] | 0.08 | –0.04 | +0.03 | +0.01 | +0.01 | 0.10 |
| Δ[Ca/Fe] | 0.05 | –0.01 | –0.02 | –0.01 | +0.00 | 0.06 |
| Δ[Sc/Fe] | 0.07a | +0.05 | +0.09 | +0.03 | +0.00 | 0.13 |
| Δ[Ti/Fe] | 0.07a | +0.01 | –0.01 | +0.03 | +0.03 | 0.09 |
| Δ[Cr/Fe] | 0.14 | +0.00 | –0.02 | +0.01 | –0.01 | 0.15 |
| Δ[Co/Fe] | 0.07a | +0.01 | +0.01 | +0.02 | +0.00 | 0.08 |
| Δ[Ni/Fe] | 0.04 | –0.01 | +0.02 | +0.00 | +0.00 | 0.05 |
| Δ[Ba/Fe] | 0.07a | +0.02 | +0.08 | –0.02 | +0.00 | 0.11 |
Notes. The first column gives the line-to-line scatter. The quantities σTeff, σlog g, and σξ give the uncertainties associated to the following changes in the atmospheric parameters: ΔTeff = +80 K, Δlog g = +0.18 dex, and Δξ = +0.07 km s-1. Note that the two other parameters were simultaneously adjusted to fulfil excitation/ionisation equilibrium of iron or to have the Fe i abundances that are independent of the line strength. Finally, σnormalisation provides the changes associated to a continuum level shifted upwards by 1%. (These values were adopted for all the stars in our sample.)
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