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 3

F-tests for trends in our activity indices.


Star	N_bins(S)	N_bins	S_Ca II		Hα		Na i		He i
			F_poly	P(F_poly)	F_poly	P(F_poly)	F_poly	P(F_poly)	F_poly	P(F_poly)

GJ361	4	4	0.475	0.72	3.13	0.37	0.00785	0.99	414	0.035
GJ2049	<4	4			0.187	0.85	0.0204	0.98	0.0733	0.93
GJ3218	<4	4			5.44	0.29	5.46	0.29	0.00831	0.99
Gl1	5	5	27.9	0.019	3.61	0.12	22.5	0.023	0.729	0.34
Gl176	6	7	1.33	0.24	0.579	0.41	0.442	0.46	0.827	0.34
Gl205	6	6	0.00533	0.56	0.0243	0.56	0.166	0.53	0.0851	0.55
Gl273	5	6	0.0998	0.52	0.0967	0.55	5.18	0.059	0.0761	0.55
Gl382	5	5	0.511	0.39	0.820	0.32	0.150	0.50	0.136	0.51
Gl393	<4	4			0.0149	0.99	27.6	0.13	0.0533	0.95
Gl433	5	6	17.6	0.030	5.15	0.059	18.4	0.011	0.0255	0.56
Gl436	6	7	0.196	0.52	2.79	0.098	0.769	0.35	0.111	0.56
Gl479	4	4	24.1	0.14	6.86	0.26	2.92	0.38	10.9	0.21
Gl526	4	4	6.02	0.28	0.666	0.66	9.94	0.22	0.168	0.87
Gl551	<4	7			0.193	0.54	0.795	0.35	0.510	0.44
Gl581	9	10	11.9	0.0022	12.2	0.0010	10.7	0.0016	4.45	0.019
Gl588	4	4	0.469	0.72	0.290	0.80	0.322	0.78	0.0387	0.96
Gl667C	8	7	0.713	0.38	3.55	0.070	1.26	0.24	4.06	0.057
Gl674	4	5	0.128	0.89	0.826	0.32	0.467	0.40	0.0445	0.54
Gl680	4	4	0.0706	0.94	1.48	0.50	4.78	0.31	0.905	0.60
Gl699	4	4	2.92	0.38	62.9	0.089	1.74	0.47	0.0186	0.98
Gl832	6	5	0.153	0.54	63.7	0.0084	0.0227	0.54	0.996	0.29
Gl849	6	6	0.285	0.49	0.673	0.37	0.325	0.48	1.08	0.28
Gl876	4	4	1.08	0.56	4.78	0.31	1.63	0.48	6.21	0.27
Gl877	<4	5			3.56	0.12	1.41	0.24	0.00635	0.54
Gl887	4	4	9.44	0.22	0.465	0.72	0.756	0.63	0.00450	0.99
Gl908	6	8	1.16	0.27	0.689	0.39	0.970	0.30	2.29	0.11
HIP12961	6	6	0.0851	0.55	0.136	0.54	2.15	0.16	0.451	0.43
HIP19394	<4	6			1.37	0.23	2.15	0.16	5.83	0.051
HIP38594	<4	4			1399	0.019	37.3	0.12	0.322	0.78
HIP85647	5	5	4.15	0.11	3.66	0.12	15.3	0.034	0.133	0.51

Notes. The F-value used was , where is the chi-squared of the straight line model, the chi-squared of the polynomial model, and N the number of bins. This test will give the probability that a second-order polynomial is a better fit to the data than a straight line. Bold values indicate probabilities lower than 0.05 (95% significance level).

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