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Table 1.

Stars used to calibrate SCaII to the Mt. Wilson scale.

Star N Tspan SCaII σSCaII SMW σSMW Ref.
[days] [days]
12 Oph 11 2530 0.310 0.018 0.339 1
14 Cet 13 4360 0.186 0.003 0.224 1
18 Sco 193 5058 0.136 0.004 0.174 0.010 2
37 Cet 16 3304 0.128 0.002 0.148 0.002 2
61 Vir 227 4946 0.133 0.002 0.162 1
70 Oph A 6 4 0.282 0.003 0.392 1
89 Leo 15 4286 0.167 0.002 0.202 1
94 Aqr 25 1718 0.121 0.004 0.155 1
9 Cet 10 322 0.271 0.008 0.349 1
α CMi 11 309 0.140 0.000 0.171 1
β Aql 21 1017 0.111 0.001 0.136 1
δ Eri 152 4877 0.106 0.002 0.137 1
ϵ Eri 31 4304 0.408 0.021 0.496 1
η Ser 6 4 0.094 0.001 0.122 0.003 2
ι Cap 8 1507 0.230 0.008 0.301 0.004 2
ι Psc 28 2533 0.134 0.002 0.150 0.001 2
ξ2 Sgr 2 1 0.088 0.000 0.112 0.002 2
o2 Eri 100 4530 0.150 0.010 0.206 1
o Aql 11 432 0.120 0.001 0.148 1
ϕ4 Cet 9 3116 0.088 0.003 0.110 0.003 2
ψ1 Aqr 1 0 0.077 0.000 0.105 0.002 2
σ Boo 7 771 0.178 0.002 0.190 0.002 2
σ Peg 28 1782 0.119 0.001 0.142 1
τ Cet 595 5146 0.140 0.001 0.171 1
HD 126053 2 1 0.144 0.001 0.165 1
HD 152391 36 1674 0.338 0.016 0.393 1
HD 160346 31 1674 0.254 0.031 0.300 1
HD 16160 44 1776 0.182 0.020 0.226 1
HD 170231 17 3018 0.153 0.006 0.233 0.054 2
HD 176983 1 0 0.212 0.000 0.294 0.022 2
HD 195564 37 4363 0.116 0.001 0.130 0.004 2
HD 210277 28 4148 0.121 0.002 0.142 0.007 2
HD 25825 5 3622 0.243 0.015 0.278 0.013 2
HD 26913 5 168 0.340 0.038 0.396 1
HD 26923 35 4009 0.233 0.016 0.287 1
HD 27282 3 3617 0.284 0.022 0.366 0.027 2
HD 28635 4 3428 0.213 0.002 0.251 0.013 2
HD 32147 35 4700 0.227 0.013 0.286 1
HD 42807 13 4686 0.279 0.011 0.352 0.007 2
HD 4628 41 4477 0.168 0.010 0.230 1
HD 73667 1 0 0.139 0.000 0.179 0.007 2
HD 76151 7 3309 0.184 0.006 0.246 1
V2213 Oph 10 611 0.232 0.006 0.269 1

Notes. N is the number of nights of observations, and Tspan the time-span of our sample, SCaII our uncalibrated median S-index, and SMW the literature median S-index in the Mt. Wilson scale. The errors are standard deviations. Errors for the indices in Baliunas et al. (1995a) were not published.

References. (1) Baliunas et al. (1995a), (2) Duncan et al. (1991).

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