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Table 10
Difference between the parameters derived from the two methods (using degraded synthetic spectra instead of observations) and the reference values for different levels of signal-to-noise ratio (S/N).
| Synthetic spectral fitting | Equivalent width | |||||||||||
| ΔTeff | Δlog (g) | Δ[M/H] | ΔTeff | Δlog (g) | Δ[M/H] | |||||||
| S/N | μ | σ | μ | σ | μ | σ | μ | σ | μ | σ | μ | σ |
|
|
||||||||||||
| 5 | 129 | 129 | 0.15 | 0.22 | 0.23 | 0.22 | 510 | 427 | 1.16 | 0.96 | 0.28 | 0.58 |
| 10 | 39 | 44 | 0.08 | 0.08 | 0.04 | 0.04 | 285 | 486 | 0.71 | 0.74 | 0.23 | 0.55 |
| 20 | 13 | 16 | 0.02 | 0.02 | 0.00 | 0.02 | 219 | 365 | 0.50 | 0.72 | 0.15 | 0.40 |
| 25 | 7 | 12 | 0.01 | 0.03 | 0.00 | 0.01 | 177 | 392 | 0.50 | 0.63 | 0.14 | 0.38 |
| 30 | 6 | 10 | 0.01 | 0.03 | 0.00 | 0.01 | 133 | 272 | 0.46 | 0.64 | 0.06 | 0.27 |
| 40 | 0 | 6 | 0.00 | 0.02 | −0.01 | 0.01 | 149 | 293 | 0.39 | 0.61 | 0.02 | 0.21 |
| 50 | 3 | 5 | 0.00 | 0.02 | −0.01 | 0.01 | 111 | 346 | 0.30 | 0.95 | −0.01 | 0.26 |
| 100 | 2 | 5 | 0.00 | 0.01 | 0.00 | 0.01 | 155 | 261 | 0.37 | 0.59 | −0.01 | 0.22 |
Notes. The synthetic spectra had a resolution of 70 000.
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