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

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Table 3

Average difference and standard deviation (left) between the synthetic spectral fitting technique 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


All elements + wings	−24	124	−0.11	0.21	0.01	0.14	15	0.06	0.01
Only iron + wings	−2	110	−0.13	0.34	0.00	0.18	18	0.05	0.02
Only iron	−2	129	−0.29	0.35	−0.04	0.16	19	0.05	0.02


Relaxed EWR limit	−24	124	−0.11	0.21	0.01	0.14	15	0.06	0.01
Strong EWR limit	−14	122	−0.10	0.19	0.05	0.16	20	0.05	0.02
Unlimited EWR	−11	119	−0.07	0.21	0.02	0.14	16	0.04	0.01


GES	−24	124	−0.11	0.21	0.01	0.14	15	0.06	0.01
VALD	4	119	−0.09	0.18	0.06	0.14	15	0.06	0.01
SPECTRUM	6	158	−0.17	0.25	0.07	0.16	19	0.05	0.02


MARCS/Grevesse 2007	−24	124	−0.11	0.21	0.01	0.14	15	0.06	0.01
MARCS/Asplund 2005	−28	125	−0.17	0.25	0.01	0.14	13	0.05	0.02
ATLAS/Grevesse 2007	−47	244	−0.12	0.27	0.00	0.22	15	0.04	0.01
ATLAS/Asplund 2005	−50	243	−0.16	0.26	0.00	0.22	16	0.04	0.01


Estimate initial AP	−24	124	−0.11	0.21	0.01	0.14	15	0.06	0.01
Fixed initial AP	−27	122	−0.12	0.22	0.02	0.15	12	0.05	0.01


R = 70 000	−24	124	−0.11	0.21	0.01	0.14	15	0.06	0.01
R = 16 200	−31	139	−0.15	0.20	0.06	0.22	18	0.06	0.03
R = 16 200/re-norm	−58	137	−0.10	0.16	−0.07	0.14	17	0.06	0.02

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

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