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Table 2
Errors on the atmospheric parameters and abundances of HD 149757 arising from the choice of the instrument and microturbulence value.
| Parameter | σ instr | σ micro | σ | ||||||||||||||
|
|
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| Teff [K] | 630 | 320 | 1000 | ||||||||||||||
| log g | 0.06 | 0.07 | 0.10 | ||||||||||||||
| y | 0.010 | 0.022 | 0.025 | ||||||||||||||
| log ϵ(C) | 0.10 | 0.06 | 0.12 | ||||||||||||||
| log ϵ(N) | 0.12 | 0.04 | 0.13 | ||||||||||||||
| log ϵ(O) | 0.13 | 0.16 | 0.21 | ||||||||||||||
| [N/C] | 0.21 | 0.02 | 0.21 | ||||||||||||||
| [N/O] | 0.01 | 0.12 | 0.12 | ||||||||||||||
Notes. The last column gives the adopted (combined) uncertainty. σ corresponds to 
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