Na-O anticorrelation and HB - IX. Kinematics of the program clusters A link between systemic rotation and HB morphology?

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Volume 538 (February 2012)

A&A, 538 (2012) A18

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Table 2

Kinematics of Na-rich^* and Na-poor^* stars in selected clusters.

Clus.	[Na/Fe]_Tr^*	⟨RV_Na−poor⟩	σ_Na−poor	N_Na−poor	⟨RV_Na−rich⟩	σ_Na−rich	N_Na−rich	F_r/p^a	Prob.^a
		[km s^-1]	[km s^-1]		[km s^-1]	[km s^-1]

NGC 2808	0.4	103.7	10.2	82	99.4	7.5	41	1.864	0.008
	0.5	103.2	10.0	98	98.5	6.6	25	2.269	0.002
NGC 6388	0.4	84.4	9.6	17	81.1	7.2	18	1.732	0.132
	0.5	83.4	9.3	24	81.1	6.6	11	1.957	0.082
NGC 6441	0.4	19.2	13.7	13	23.6	12.5	16	1.202	0.373
	0.5	22.2	15.0	17	20.8	10.1	12	2.203	0.067
NGC 6752	0.4	–26.4	5.7	51	–26.4	5.0	62	1.302	0.166
	0.5	–26.4	5.6	60	–26.2	5.0	53	1.248	0.202
NGC 6809	0.4	175.0	4.0	58	174.8	3.6	64	1.263	0.184
	0.5	174.7	3.9	83	175.3	3.5	39	1.254	0.194

Notes.

^(*)

The definition of Na-rich and Na-poor: Na-rich stars have [Na/Fe] ≥ Tr, while Na-poor stars have [Na/Fe] < [Na/Fe]_Tr.

^(a)

; Prob. = probability that the two samples have the same variance, according to the F-test.

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