Long-term magnetic activity of a sample of M-dwarf stars from the HARPS program - I. Comparison of activity indices

J. Gomes da Silva; N. C. Santos; X. Bonfils; X. Delfosse; T. Forveille; S. Udry

doi:10.1051/0004-6361/201116971

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Volume 534 (October 2011)

A&A, 534 (2011) A30

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Table 2

Variability F-tests for the activity indices. Bold values indicate probabilities lower than 0.05 (95% significance level).


Star	N_bins(S)	N_bins	S_Ca II			Hα			Na i			He i
			σ_e	⟨ σ_i ⟩	P(F_const)	σ_e	⟨ σ_i ⟩	P(F_const)	σ_e	⟨ σ_i ⟩	P(F_const)	σ_e	⟨ σ_i ⟩	P(F_const)

GJ361	4	4	0.0028	0.0012	0.087	0.00034	0.00020	0.21	0.0032	0.0014	0.10	0.000079	0.00014	0.82
GJ2049	<4	4				0.00019	0.00011	0.22	0.0036	0.0013	0.059	0.00014	0.000068	0.13
GJ3218	<4	4				0.0013	0.00045	0.055	0.0077	0.0030	0.077	0.00019	0.00016	0.40
Gl1	5	5	0.0015	0.00054	0.034	0.00038	0.00011	0.018	0.0018	0.0011	0.18	0.000081	0.00010	0.66
Gl176	6	7	0.0036	0.0027	0.27	0.00061	0.00043	0.21	0.0064	0.0038	0.12	0.00027	0.00015	0.097
Gl205	6	6	0.0031	0.0026	0.35	0.00029	0.00029	0.49	0.0045	0.0029	0.17	0.00018	0.000060	0.015
Gl273	5	6	0.0037	0.0010	0.016	0.00043	0.00022	0.080	0.0033	0.0014	0.044	0.000055	0.00014	0.97
Gl382	5	5	0.0035	0.0031	0.41	0.00075	0.00043	0.15	0.0051	0.0027	0.12	0.000049	0.000091	0.87
Gl393	<4	4				0.00028	0.00023	0.36	0.0020	0.0016	0.35	0.00016	0.00015	0.49
Gl433	5	6	0.0024	0.00085	0.033	0.00036	0.000065	0.00093	0.0033	0.0011	0.014	0.00013	0.000075	0.13
Gl436	6	7	0.00095	0.00056	0.13	0.00031	0.000065	0.00068	0.0031	0.00097	0.0064	0.00013	0.00011	0.32
Gl479	4	4	0.0035	0.0024	0.28	0.00045	0.00047	0.53	0.0027	0.0026	0.48	0.00023	0.00014	0.22
Gl526	4	4	0.0015	0.00077	0.15	0.00015	0.00011	0.31	0.0036	0.0011	0.041	0.000054	0.000075	0.71
Gl551	<4	7				0.014	0.0078	0.11	0.043	0.046	0.56	0.0064	0.0035	0.081
Gl581	9	10	0.0018	0.00064	0.0041	0.00029	0.000096	0.0016	0.0022	0.0013	0.072	0.00011	0.000079	0.17
Gl588	4	4	0.0020	0.00044	0.017	0.00051	0.00011	0.015	0.0040	0.00081	0.013	0.00013	0.00011	0.40
Gl667C	8	7	0.0019	0.00080	0.016	0.00018	0.00012	0.20	0.0032	0.0014	0.026	0.000039	0.000054	0.78
Gl674	4	5	0.0012	0.0030	0.92	0.0012	0.00070	0.16	0.0037	0.0029	0.33	0.00025	0.00015	0.18
Gl680	4	4	0.0019	0.0015	0.37	0.00019	0.00014	0.31	0.0024	0.0018	0.31	0.00028	0.00012	0.096
Gl699	4	4	0.0011	0.0015	0.68	0.00065	0.00019	0.038	0.0022	0.0025	0.58	0.00019	0.00015	0.37
Gl832	6	5	0.0037	0.0011	0.0074	0.00012	0.00013	0.53	0.0039	0.0015	0.047	0.000067	0.000075	0.58
Gl849	6	6	0.0016	0.0012	0.23	0.00029	0.00012	0.044	0.0032	0.0013	0.032	0.00012	0.000097	0.31
Gl876	4	4	0.0036	0.0014	0.075	0.00012	0.00014	0.63	0.0054	0.0017	0.043	0.00015	0.000082	0.18
Gl877	<4	5				0.00047	0.00018	0.044	0.0065	0.0011	0.0026	0.000098	0.00012	0.65
Gl887	4	4	0.0029	0.0011	0.077	0.00033	0.00015	0.11	0.0039	0.0014	0.063	0.00016	0.000067	0.088
Gl908	6	8	0.0022	0.00060	0.0071	0.00022	0.00015	0.18	0.0033	0.0015	0.024	0.00020	0.000074	0.010
HIP12961	6	6	0.0015	0.0021	0.75	0.00017	0.00019	0.62	0.0029	0.0016	0.10	0.00013	0.000062	0.070
HIP19394	<4	6				0.00031	0.00012	0.031	0.0036	0.0021	0.12	0.00019	0.00020	0.53
HIP38594	<4	4				0.00040	0.000063	0.0064	0.0058	0.0020	0.055	0.00013	0.00012	0.42
HIP85647	5	5	0.0041	0.0016	0.046	0.00035	0.00015	0.067	0.0040	0.0016	0.055	0.00017	0.000056	0.028

Notes. The F-value used was / ⟨ σ_i ⟩ ² where σ_e is the rms of the index (binned) and ⟨ σ_i ⟩ the average of the error on the mean for the binned activity data of each star.

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