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Home All issues Volume 505 / No 2 (October II 2009) A&A, 505 2 (2009) 859-871 Full HTML
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Table 4:

Tests for variability and trends.
Star N T $\sigma$ $\overline{\sigma_{RV}}$ P(F) $\chi_{{\rm const.}}^{2}$ $P(\chi_{{\rm const.}}^{2})$ Slope $\chi_{{\rm slope}}^{2}$ $P(\chi_{{\rm slope}}^{2})$ $P(F_{{\rm slope}})$ Comment
    [d] [m/s] [m/s]       [m/s/yr]        
Barnard 75 2358 3.3 2.7 0.065 114 0.0022 -0.688 99.4 0.022 0.0038  
GJ 1 24 2151 2.5 2.4 0.9 27.3 0.24 -0.454 25.9 0.26 0.56  
GJ 27.1 30 2177 6.1 6.1 0.95 41.2 0.066 0.122 41.1 0.052 0.32  
GJ 118 26 2266 6.5 5.8 0.56 40.5 0.026 1.99 23.8 0.47 0.00083  
GJ 160.2 33 2325 8.1 7.7 0.79 41.1 0.13 1.36 35.5 0.26 0.067  
GJ 173 12 897 5.3 3.1 0.094 30.6 0.0013 1.61 28.7 0.0014 0.86  
GJ 180 24 2325 3.8 4.1 0.71 29.4 0.17 0.418 27.5 0.19 0.46  
GJ 190 2 4 861.8 80.7 0.12 97.4 $\bf {{<}10^{-7}}$ $-1.12\times 10^{5}$ 0 <10-7 $\bf {{<}10^{-7}}$ SB2
GJ 218 9 896 3.1 3.1 0.98 8.49 0.39 1.03 7.96 0.34 0.96  
GJ 229 32 2325 5.5 2.8 0.00036 139 $\bf {{<}10^{-7}}$ 1.43 95.6 <10-7 0.0017  
GJ 263 2 82 117.6 78.6 0.75 1.19 0.27 743 0 <10-7 $\bf {{<}10^{-7}}$ SB2
GJ 357 30 2321 5.3 3.2 0.0096 59.9 0.00064 0.393 57.5 0.00084 0.58  
GJ 377 14 1089 6.7 3.2 0.014 40 0.00014 -0.284 39.8 $7.7\times 10^{-5}$ 0.36  
GJ 422 15 1112 4.0 3.4 0.55 16.8 0.27 0.599 16.2 0.24 0.99  
GJ 433 54 2554 4.4 3.6 0.16 80 0.0097 0.284 78.4 0.011 0.61  
GJ 477 8 389 3486.0 4.3 $\bf {1.6\times 10^{-19}}$ $5.58\times 10^{6}$ $\bf {{<}10^{-7}}$ $6.99\times 10^{3}$ $4.52\times 10^{5}$ <10-7 0.00034 SB1
GJ 510 23 1115 5.6 3.5 0.039 54 0.00016 2.64 37.9 0.013 0.014  
GJ 620 5 422 7.3 4.4 0.36 13.1 0.011 -5.1 11 0.012 0.98  
GJ 637 17 1099 6.4 4.4 0.16 27 0.041 0.305 26.9 0.03 0.38  
GJ 682 20 1134 4.0 2.3 0.024 53.8 $\bf {3.6\times 10^{-5}}$ 1.62 40.8 0.0016 0.056  
GJ 739 19 1070 4.4 3.1 0.13 48.8 0.00012 -2.09 37.4 0.003 0.072  
GJ 817 25 1551 4.9 4.3 0.54 32.2 0.12 0.184 32.1 0.098 0.42  
GJ 821 35 1516 5.0 3.8 0.12 53.7 0.017 -0.268 53.5 0.013 0.56  
GJ 842 17 926 6.7 4.2 0.065 44.6 0.00016 -1.2 43.5 0.00013 0.91  
GJ 855 22 1561 5.8 4.5 0.24 28.7 0.12 -1.14 24.9 0.21 0.19  
GJ 891 25 2178 7.5 5.1 0.068 48.4 0.0023 0.556 47.6 0.0019 0.93  
GJ 911 17 2136 14.9 7.7 0.012 25.2 0.067 0.389 25.1 0.049 0.38  
GJ 1009 22 2177 5.3 4.0 0.23 47.8 0.00074 0.0316 47.8 0.00046 0.055  
GJ 1046 14 766 1248.3 3.6 $\bf {1.9\times 10^{-30}}$ $1.59\times 10^{6}$ $\bf {{<}10^{-7}}$ $1.09\times 10^{3}$ $8.8\times 10^{5}$ <10-7 0.018 SB1 (BD)
GJ 1100 12 897 9.3 5.1 0.061 37 0.00011 -1.67 36.3 $7.4\times 10^{-5}$ 0.66  
GJ 3020 13 749 298.8 9.0 $\bf {5\times 10^{-16}}$ $7.62\times 10^{3}$ $\bf {{<}10^{-7}}$ -287 $2.29\times 10^{3}$ <10-7 0.00074 SB1
GJ 3082 10 761 6.2 4.2 0.27 17.5 0.041 1.19 17.1 0.029 0.66  
GJ 3098 9 733 9.1 4.7 0.079 26.7 0.00081 7.05 16 0.025 0.13  
GJ 3671 12 1090 5.6 4.4 0.46 17.4 0.095 3.26 10.2 0.43 0.046  
GJ 3759 11 1080 3.9 3.6 0.81 11.5 0.32 2.48 6.84 0.65 0.071  
GJ 3916 6 406 2170.7 9.2 $\bf {1.5\times 10^{-11}}$ $4.07\times 10^{5}$ $\bf {{<}10^{-7}}$ $4.1\times 10^{3}$ $2.12\times 10^{3}$ <10-7 $\bf {2\times 10^{-5}}$ SB1
GJ 3973 5 420 6.8 3.6 0.25 12 0.017 3.3 10.8 0.013 0.78  
GJ 4106 5 396 20.7 15.9 0.62 7.4 0.12 32.2 1.99 0.58 0.13 giant
GJ 4293 14 875 8.7 5.6 0.13 32.3 0.0021 -0.114 32.3 0.0012 0.064  
HG 7-15 11 417 8.7 10.3 0.59 11 0.36 10.5 9.03 0.43 0.39  
Prox Cen 76 2555 3.6 2.3 0.00028 183 $\bf {{<}10^{-7}}$ 0.703 159 <10-7 0.0026  
Listed are the number of measurements N, time baseline T, RV scatter $\sigma$ (rms), mean RV measurement error $\overline{\sigma_{RV}}$, and results of statistical tests. Low values of the F-test probability P(F), as well as $P(\chi_{{\rm const}}^{2})$, e.g. 0.01, mean that a constant model is improbable, hence indicate variability (values in bold fonts). In contrast, a high $P(\chi_{{\rm slope}}^{2})$ indicates that a trend is an acceptable model while a small $P(F_{{\rm slope}})$ indicates a significant fit improvement.

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