The two metallicity groups of the globular cluster M 22: a chemical perspective

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Table 1

Sources of the spectroscopic data.

Instrument^a	R^b	λ range	S/N	S/N	# stars	Reference
		Å	@5000 Å	@7000 Å

AAT-UCLES	38 000	5050−7300	50	100	10	Diego et al. (1990)
						Norris et al. (1995b)
APO-ARCES	37 500	4000−9000	50	75	5	Wang et al. (2003)
MCD-2DC	60 000	4200−9000	70	120	6	Tull et al. (1995)
LICK-HAM	50 000	4800−8800	50	90	9	Vogt et al. (1987)
						Valenti et al. (1995)
VLT-UVES	45 000	3300−4500	100	120	16	Dekker et al. (2000)
		4800−6800				Marino et al. (2009)

Notes.

^(a)

Short-hand notation adopted in this paper.

^(b)

R ≡ λ/Δλ.

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