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Table 2

Comparison of input parameters (“In” row) and corresponding parameters obtained from fits (“Out” row) for ten exemplary mock spectra computed from complete Surface models, which simultaneously account for all lines considered in the fitting function.

S/N T eff log (g) νrad ν sin (i) ζ ξ log (n(x))
(K) (cgs) (km s-1) He C N O Ne Mg Al Si S Ar Fe
In 300 15 000 3.750 −18.0 15.0 7.0 2.00 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 305 15 000 3.750 −18.0 14.8 8.0 2.10 −1.06 −3.71 −4.28 −3.20 −4.01 −4.70 −5.60 −4.61 −4.81 −5.68 −4.61
Stat.
Sys. ...
Start ... 19 000 3.700 −15.0 10.0 10.0 3.00 −0.85 −3.60 −4.20 −3.20 −4.00 −4.60 −5.80 −4.40 −4.90 −5.60 −4.60
In 300 15 000 4.250 36.0 17.0 16.0 2.00 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 295 14 860 4.215 36.0 17.0 16.1 1.90 −1.04 −3.68 −4.32 −3.22 −4.00 −4.72 −5.60 −4.61 −4.80 −5.50 −4.65
Stat.
Sys. ...
Start ... 19 000 3.700 35.0 10.0 10.0 3.00 −0.85 −3.60 −4.20 −3.20 −4.00 −4.60 −5.80 −4.40 −4.90 −5.60 −4.60
In 100 20 000 3.750 19.0 25.0 18.0 2.0 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 100 19 960 3.734 18.9 23.5 22.0 1.94 −1.05 −3.68 −4.28 −3.19 −4.02 −4.71 −5.56 −4.57 −4.78 −5.59 −4.59
Stat.
Sys. ...
Start ... 19 000 3.700 10.0 10.0 10.0 3.0 −0.85 −3.40 −4.10 −3.10 −4.20 −4.80 −5.60 −4.20 −4.70 −5.70 −4.50
In 250 20 000 4.250 25.0 5.0 26.0 2.00 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 254 19 990 4.251 25.0 0.0 26.9 2.26 −1.07 −3.73 −4.31 −3.22 −4.02 −4.72 −5.58 −4.64 −4.81 −5.61 −4.60
Stat.
Sys. ...
Start ... 17 000 4.000 20.0 10.0 10.0 3.00 −0.85 −3.40 −4.10 −3.10 −3.80 −4.40 −5.90 −4.70 −4.80 −5.50 −4.70
In 400 25 000 3.750 −25.0 40.0 28.0 2.00 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 396 24 930 3.738 −25.0 39.7 28.5 2.02 −1.07 −3.72 −4.31 −3.21 −4.00 −4.70 −5.61 −4.61 −4.81 −5.63 −4.61
Stat.
Sys. ...
Start ... 23 500 3.800 −20.0 10.0 10.0 8.00 −1.10 −3.50 −4.10 −3.30 −4.10 −4.50 −6.00 −4.20 −4.70 −5.40 −4.30
In 275 25 000 4.250 25.0 70.0 0.0 2.00 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 274 25 010 4.259 25.0 69.8 3.6 2.00 −1.05 −3.71 −4.29 −3.21 −3.99 −4.68 −5.60 −4.61 −4.82 −5.59 −4.61
Stat.
Sys. ...
Start ... 19 000 3.700 30.0 10.0 10.0 3.00 −0.85 −3.80 −4.40 −3.40 −4.20 −4.80 −5.90 −4.50 −4.70 −5.80 −4.90
In 125 30 000 4.250 −15.0 0.0 18.0 2.00 −1.06 −3.70 −4.30 −3.20 −4.00 −4.70 −5.60 −4.60 −4.80 −5.60 −4.60
Out 120 30 110 4.259 −15.0 5.8 16.4 1.84 −1.04 −3.72 −4.31 −3.21 −4.02 −4.69 −5.61 −4.61 −4.81 −5.47 −4.60
Stat.
Sys. ...
Start ... 32 000 4.400 −15.0 1.0 0.0 7.00 −1.15 −3.70 −4.10 −3.10 −4.20 −4.70 −5.90 −4.70 −4.60 −5.40 −4.80
Mock spectrum as a proxy to the observed spectrum of object #1 in Table 4:
In 250 23 880 4.127 23.0 5.0 4.0 2.00 −0.99 −3.73 −4.30 −3.29 −4.00 −4.57 −5.79 −4.66 −4.88 −5.49 −4.71
Out 232 23 800 4.109 23.0 4.7 4.0 2.02 −0.99 −3.74 −4.30 −3.30 −4.02 −4.57 −5.80 −4.66 −4.90 −5.51 −4.73
Stat.
Sys. ...
Start ... 19 000 3.700 20.0 10.0 10.0 3.00 −0.90 −3.50 −4.30 −3.30 −4.20 −4.50 −5.80 −4.50 −4.90 −5.50 −4.70
Mock spectrum as a proxy to the observed spectrum of object #2 in Table 4:
In 250 19 250 4.052 31.0 7.0 17.0 2.00 −1.00 −3.64 −4.23 −3.21 −4.06 −4.60 −5.71 −4.48 −4.89 −5.57 −4.63
Out 242 19 240 4.058 31.0 4.8 18.0 2.07 −1.00 −3.64 −4.23 −3.22 −4.06 −4.62 −5.70 −4.51 −4.89 −5.57 −4.65
Stat.
Sys. ...
Start ... 17 000 3.700 20.0 10.0 10.0 3.00 −0.85 −3.50 −3.90 −3.40 −3.80 −4.40 −5.40 −4.00 −4.70 −5.40 −4.80
Mock spectrum as a proxy to the observed spectrum of object #3 in Table 4:
In 200 29 210 4.284 30.0 31.0 0.0 3.20 −1.05 −3.71 −4.13 −3.40 −4.01 −4.58 −5.73 −4.66 −4.97 −5.83 −4.62
Out 197 29 190 4.273 30.1 30.8 0.0 3.12 −1.04 −3.74 −4.13 −3.41 −4.04 −4.63 −5.76 −4.66 −5.00 −5.87 −4.62
Stat.
Sys. ...
Start ... 31 000 4.300 20.0 10.0 10.0 7.00 −1.05 −3.60 −4.20 −3.20 −4.10 −4.60 −5.80 −4.40 −4.90 −5.60 −4.60

Notes. Starting parameters for the fitting algorithm are given as well (“Start” row). See Sect. 3.2 for details. The S/N estimates in the “Out” row are based on the method outlined in Sect. 3.1. The abundance n(x) is given as fractional particle number of species x with respect to all elements. Statistical uncertainties (“Stat.” row) correspond to Δχ2 = 6.63 and are 99%-confidence limits. Systematic uncertainties (“Sys.” row) cover only the effects induced by additional variations of 2% in Teff and 0.1 dex in log (g) (see Sect. 3.3 for details) and are formally taken to be 99%-confidence limits.

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