Multiple populations in ω Centauri: a cluster analysis of spectroscopic data

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Table 1

Main group parameters.

Group	Colour	Datum	N. stars	[m/H]	[Fe/H]	[α/Fe]	[O/Na]	[O/Fe]	[Na/Fe]	[Al/Fe]	[La/Fe]	[Eu/Fe]	RV
	code												(km s^-1)

Metal-Poor groups
#4	Blue	avg	148	–1.738	–1.758	0.20	0.60	0.39	–0.22	0.34	–0.16	0.16	232.4 ± 1.1
		st.dev.		0.118	0.133	0.08	0.21	0.11	0.20	0.24	0.17	0.20	14.5
#6	Turquoise	avg	132	–1.752	–1.794	0.21	0.01	0.18	0.17	0.62	–0.17	0.20	231.6 ± 1.2
		st.dev.		0.115	0.117	0.08	0.22	0.18	0.17	0.30	0.18	0.25	13.9

Metal-Intermediate groups
#5	Dark green	avg	162	–1.562	–1.575	0.27	0.47	0.46	–0.01	0.34	0.35	0.11	232.9 ± 1.0
		st.dev.		0.182	0.196	0.12	0.18	0.13	0.16	0.23	0.16	0.21	13.1
#1	Bright green	avg	132	–1.642	–1.696	0.28	–0.04	0.23	0.27	0.69	0.30	0.18	230.8 ± 1.3
		st.dev.		0.138	0.172	0.11	0.18	0.18	0.17	0.32	0.18	0.28	14.5
#3	Magenta	avg	127	–1.600	–1.523	0.32	–0.74	–0.38	0.37	1.04	0.39	0.18	230.6 ± 1.3
		st.dev.		0.120	0.174	0.08	0.20	0.23	0.14	0.21	0.26	0.16	14.7
#2a	Red	avg	49	–1.444	–1.308	0.36	–1.20	–0.66	0.54	0.98	0.58	0.17	232.3 ± 2.2
		st.dev.		0.177	0.156	0.08	0.22	0.26	0.14	0.15	0.20	0.18	15.3

Metal-Rich group
#2b	Yellow	avg	47	–1.176	–0.920	0.36	–0.93	–0.19	0.74	0.67	0.49	0.20	230.8 ± 1.3
		st.dev.		0.212	0.192	0.14	0.19	0.26	0.26	0.30	0.18	0.26	9.1

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