Determining stellar atmospheric parameters and chemical abundances of FGK stars with iSpec

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Table 5

Average difference and standard deviation (left) between the equivalent width method and the reference values.

	Differences						Dispersion
	ΔT_eff		Δlog (g)		Δ[M/H]		ΔT_eff	Δlog (g)	Δ[M/H]
Case	μ	σ	μ	σ	μ	σ


Medium-quality lines	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
High-quality lines	129	311	0.14	0.47	0.09	0.30	39	0.09	0.06


Relaxed EWR limit	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
Strong EWR limit	134	259	0.30	0.50	0.13	0.23	41	0.09	0.02
Unlimited EWR	173	371	0.20	0.53	0.21	0.45	58	0.14	0.06


Outlier filter	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
With outliers	178	374	0.41	0.67	0.13	0.31	80	0.18	0.06


GES	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
VALD	118	313	0.20	0.58	0.19	0.24	57	0.12	0.06
SPECTRUM	−1	326	−0.06	0.45	0.10	0.29	67	0.12	0.05


MARCS	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
ATLAS	157	221	0.22	0.44	0.13	0.26	37	0.12	0.03


Estimate initial AP	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
Fixed initial AP	152	359	−0.23	0.81	0.08	0.26	49	0.18	0.04


R = 70 000	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
R = 16 200	419	598	0.62	0.99	0.53	0.57	118	0.25	0.11
R = 16 200/re-norm	475	520	0.86	0.89	0.21	0.79	62	0.17	0.05


Gaussian profiles	135	241	0.20	0.44	0.12	0.27	38	0.12	0.03
Voigt profiles	131	286	0.30	0.52	0.14	0.24	97	0.19	0.06

Notes. Average dispersion (right) for stars with multiple observed spectra.

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