Table 1: Mean radial velocities and general information for 37 members in Melotte 20.
He V B-V V-I_k U-B Sp.T. $\mu_{\alpha}$ $\mu_{\delta}$ Prob $V_{\rm r}$ $\epsilon$ n $\Delta T$ P( $\chi^2$ ) $Vr_{{\rm litt}}$ N Astr Diff Notes

12 10.09 0.51 0.03 F6 V 25.1 -24.6 .99 -0.32 2.44 5 4402 0.001 -1.2 1 2.11 1.78 SB?

135 9.71 0.49 0.01 F5 V 23.5 -23.8 .99 -2.43 0.37 4 2567 0.615 -1.0 1 1.88 4.31

174 11.62 0.95 0.85 27.2 -25.1 .99 -1.54 0.22 4 2629 0.383 -2.4 2 2.25 3.79 dbl

270 10.11 0.51 0.01 F7 V 22.6 -22.0 .79 +0.74 1.77 6 4402 0.000 +0.1 1 2.42 1.68 SB

299 11.19 0.64 0.56 F7 18.5 -19.0 .87 -1.82 0.48 5 4104 0.019 -2.1 1 2.10 3.92

309 9.96 0.49 0.01 F5 V 23.4 -21.4 .86 +3.84 3.37 1 +3.1 1 3.60 -0.24

334 10.33 0.56 0.45 0.04 F7 V 22.5 -23.1 .00 -2.47 0.72 6 4405 0.004 -2.2 2 3.94 6.41

338 9.93 0.56 0.02 F7 V 26.5 -26.8 .96 +0.78 3.14 1 +1.2 1 3.75 2.97 dbl

350 11.13 0.71 G3 23.2 -23.0 .99 -0.55 1.16 5 5081 0.175 4.19 4.74

361 9.68 0.44 0.01 F4 V 22.9 -22.5 .69 -2.43 0.77 4 2889 0.745 +0.5 1 3.22 5.65

389 11.17 0.67 0.55 G0 22.5 -23.9 .99 -1.96 0.10 2 14 0.479 2.50 4.46

453 10.39 0.62 0.53 0.12 F8 V 22.8 -23.5 .00 -5.25 6.81 3 711 0.000 -1.7 2 3.44 8.69 SB

490 9.56 0.45 0.31 0.04 F3 IV-V 23.1 -25.6 .99 -1.65 0.52 4 2885 0.182 -1.4 2 2.89 4.54

601 11.40 0.74 0.59 0.20 22.9 -24.1 .00 -0.84 0.26 5 4065 0.960 -0.9 1

621 9.86 0.49 0.02 F4 V 22.5 -27.0 .96 -0.51 0.67 5 4113 0.480 -1.7 2 3.33 3.84

660 10.06 0.56 0.50 0.11 F5 V 23.1 -25.5 .99 -0.88 1.18 6 4406 0.064 -1.0 2 2.64 3.52 dbl

684 10.54 0.56 0.45 0.04 F9 V 20.6 -25.8 .98 +2.77 0.60 2 4810 0.000 -1.4 1 3.25 0.48 SB

696 11.42 0.74 0.65 0.18 19.8 -25.0 .89 -0.62 0.26 6 4065 0.221 -1.1 1

733 9.94 0.50 0.04 F6 V 22.1 -26.6 .99 +1.79 1.59 6 4338 0.021 +0.6 1 3.31 1.52

750 10.54 0.59 0.09 F9 V 22.0 -25.6 .99 -0.64 0.57 5 4109 0.295 +0.6 1 3.26 3.90

767 10.66 0.60 0.08 F9 V 21.1 -26.0 .95 -0.97 0.33 5 4109 0.066 -1.5 3 2.98 3.95

794 10.06 0.55 0.46 0.07 F3 IV-V 21.4 -24.8 .93 +2.51 3.85 4 358 0.000 +2.5 1 2.82 0.31 SB

828 11.59 0.71 0.64 F8 19.4 -26.2 .98 +0.60 0.27 4 2890 0.420 +1.0 1

833 10.03 0.49 0.42 0.03 F6 V 22.5 -27.0 .99 +0.33 0.83 8 4109 0.025 +0.4 2

848 9.99 0.59 0.46 0.07 F9 V 22.2 -26.4 .99 -0.26 0.22 41 4115 0.000 +3.1 2 3.66 3.92 SB2O

859 10.48 0.56 0.48 0.02 G0 23.6 -7.1 .00 +0.72 0.91 10 5225 0.000 +4.8 1 SB

863 9.21 0.52 0.02 F6 V 20.8 -27.2 .99 -23.30 4.81 1 -7.0 1 3.37 SB

917 11.10 0.70 0.57 0.19 F4 23.9 -28.3 .99 -0.08 1.12 5 4022 0.095 +1.0 1

968 10.41 0.57 0.03 F8 V 21.1 -27.6 .99 +0.88 0.88 6 4107 0.221 -3.3 3 3.67 2.79

988 9.80 0.56 0.07 F5 IV-V 26.8 -38.0 .99 +2.45 0.32 5 4109 0.249 +1.8 1 dbl

992 10.84 0.72 0.64 0.23 G0 15.3 -11.0 .00 1 -5.2 1 SB2

1086 11.32 0.67 0.58 G0 20.7 -24.7 .99 -1.52 0.15 1 -1.0 1 2.90 4.42

1101 11.25 0.69 0.62 G4 20.9 -28.5 .99 -0.33 0.87 3 1924 0.368 -2.4 1 3.36 3.69

1144 11.32 0.73 G5 32.3 -12.4 -6.57 0.15 1 +9.7 1 SB

1180 10.07 0.49 0.37 F7 20.9 -27.9 .99 -0.34 2.35 4 2983 0.004 3.81 4.25

1185 11.19 0.72 0.19 F7 19.9 -27.9 .99 -2.15 0.97 8 5138 0.000 3.84 5.99 SB

1234 10.81 0.72 0.61 G2 21.4 -33.7 .98 1 +5.7 1 2.82 SB2

Notes: He: identification of Heckmann et al. (1956); the V, (B-V), (V-I)_K and (U-B) photometry from WEBDA or Prosser et al. (1996, 1998a,b); Sp.T.: MK spectral type; $\mu_{\alpha}$ , $\mu_{\delta}$ : UCAC2 proper motions, Prob: membership probabilities of Fresneau (1980); $V_{\rm r}$ : the mean radial velocities; $\epsilon$ : error on the mean; n: number of observations; $\Delta T$ : time interval of the observations; $P(\chi^2)$ : probability $P(\chi^2)$ ; $Vr_{{\rm litt}}$ : radial velocities from Stauffer et al. (1985, 1989) or Prosser (1992, 1994); N: number of spectra; Astr: astrometric radial velocity (Makarov 2006); Diff: difference with the observed radial velocity. Notes: remarks on duplicity and membership (SB: spectroscopic binary, SB2: double-lined binary; SB2O: double-lined binary with an orbit; dbl: photometric binary).

**Table 1:** Mean radial velocities and general information for 37 members in Melotte 20.
He	V	B-V	V-I_k	U-B	Sp.T.	$\mu_{\alpha}$	$\mu_{\delta}$	Prob	$V_{\rm r}$	$\epsilon$	n	$\Delta T$	P( $\chi^2$ )	$Vr_{{\rm litt}}$	N	Astr	Diff	Notes
12	10.09	0.51		0.03	F6 V	25.1	-24.6	.99	-0.32	2.44	5	4402	0.001	-1.2	1	2.11	1.78	SB?
135	9.71	0.49		0.01	F5 V	23.5	-23.8	.99	-2.43	0.37	4	2567	0.615	-1.0	1	1.88	4.31
174	11.62	0.95	0.85			27.2	-25.1	.99	-1.54	0.22	4	2629	0.383	-2.4	2	2.25	3.79	dbl
270	10.11	0.51		0.01	F7 V	22.6	-22.0	.79	+0.74	1.77	6	4402	0.000	+0.1	1	2.42	1.68	SB
299	11.19	0.64	0.56		F7	18.5	-19.0	.87	-1.82	0.48	5	4104	0.019	-2.1	1	2.10	3.92
309	9.96	0.49		0.01	F5 V	23.4	-21.4	.86	+3.84	3.37	1			+3.1	1	3.60	-0.24
334	10.33	0.56	0.45	0.04	F7 V	22.5	-23.1	.00	-2.47	0.72	6	4405	0.004	-2.2	2	3.94	6.41
338	9.93	0.56		0.02	F7 V	26.5	-26.8	.96	+0.78	3.14	1			+1.2	1	3.75	2.97	dbl
350	11.13	0.71			G3	23.2	-23.0	.99	-0.55	1.16	5	5081	0.175			4.19	4.74
361	9.68	0.44		0.01	F4 V	22.9	-22.5	.69	-2.43	0.77	4	2889	0.745	+0.5	1	3.22	5.65
389	11.17	0.67	0.55		G0	22.5	-23.9	.99	-1.96	0.10	2	14	0.479			2.50	4.46
453	10.39	0.62	0.53	0.12	F8 V	22.8	-23.5	.00	-5.25	6.81	3	711	0.000	-1.7	2	3.44	8.69	SB
490	9.56	0.45	0.31	0.04	F3 IV-V	23.1	-25.6	.99	-1.65	0.52	4	2885	0.182	-1.4	2	2.89	4.54
601	11.40	0.74	0.59	0.20		22.9	-24.1	.00	-0.84	0.26	5	4065	0.960	-0.9	1
621	9.86	0.49		0.02	F4 V	22.5	-27.0	.96	-0.51	0.67	5	4113	0.480	-1.7	2	3.33	3.84
660	10.06	0.56	0.50	0.11	F5 V	23.1	-25.5	.99	-0.88	1.18	6	4406	0.064	-1.0	2	2.64	3.52	dbl
684	10.54	0.56	0.45	0.04	F9 V	20.6	-25.8	.98	+2.77	0.60	2	4810	0.000	-1.4	1	3.25	0.48	SB
696	11.42	0.74	0.65	0.18		19.8	-25.0	.89	-0.62	0.26	6	4065	0.221	-1.1	1
733	9.94	0.50		0.04	F6 V	22.1	-26.6	.99	+1.79	1.59	6	4338	0.021	+0.6	1	3.31	1.52
750	10.54	0.59		0.09	F9 V	22.0	-25.6	.99	-0.64	0.57	5	4109	0.295	+0.6	1	3.26	3.90
767	10.66	0.60		0.08	F9 V	21.1	-26.0	.95	-0.97	0.33	5	4109	0.066	-1.5	3	2.98	3.95
794	10.06	0.55	0.46	0.07	F3 IV-V	21.4	-24.8	.93	+2.51	3.85	4	358	0.000	+2.5	1	2.82	0.31	SB
828	11.59	0.71	0.64		F8	19.4	-26.2	.98	+0.60	0.27	4	2890	0.420	+1.0	1
833	10.03	0.49	0.42	0.03	F6 V	22.5	-27.0	.99	+0.33	0.83	8	4109	0.025	+0.4	2
848	9.99	0.59	0.46	0.07	F9 V	22.2	-26.4	.99	-0.26	0.22	41	4115	0.000	+3.1	2	3.66	3.92	SB2O
859	10.48	0.56	0.48	0.02	G0	23.6	-7.1	.00	+0.72	0.91	10	5225	0.000	+4.8	1			SB
863	9.21	0.52		0.02	F6 V	20.8	-27.2	.99	-23.30	4.81	1			-7.0	1	3.37		SB
917	11.10	0.70	0.57	0.19	F4	23.9	-28.3	.99	-0.08	1.12	5	4022	0.095	+1.0	1
968	10.41	0.57		0.03	F8 V	21.1	-27.6	.99	+0.88	0.88	6	4107	0.221	-3.3	3	3.67	2.79
988	9.80	0.56		0.07	F5 IV-V	26.8	-38.0	.99	+2.45	0.32	5	4109	0.249	+1.8	1			dbl
992	10.84	0.72	0.64	0.23	G0	15.3	-11.0	.00			1			-5.2	1			SB2
1086	11.32	0.67	0.58		G0	20.7	-24.7	.99	-1.52	0.15	1			-1.0	1	2.90	4.42
1101	11.25	0.69	0.62		G4	20.9	-28.5	.99	-0.33	0.87	3	1924	0.368	-2.4	1	3.36	3.69
1144	11.32	0.73			G5	32.3	-12.4		-6.57	0.15	1			+9.7	1			SB
1180	10.07	0.49	0.37		F7	20.9	-27.9	.99	-0.34	2.35	4	2983	0.004			3.81	4.25
1185	11.19	0.72		0.19	F7	19.9	-27.9	.99	-2.15	0.97	8	5138	0.000			3.84	5.99	SB
1234	10.81	0.72	0.61		G2	21.4	-33.7	.98			1			+5.7	1	2.82		SB2

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