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Table 3

F-tests for trends in our activity indices.

Star Nbins(S) Nbins SCa   II Hα Na i He i
Fpoly P(Fpoly) Fpoly P(Fpoly) Fpoly P(Fpoly) Fpoly P(Fpoly)
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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