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The Sun in Time: Activity and Environment 45
Table 4 – Continued
λ Line log Tmax 0.01 Gyr 0.1 Gyr 0.3 Gyr 0.65 Gyr 1.6 Gyr 4.56 Gyr 6.7 Gyr
(˚A) TW Hya 47 Cas EK Dra π 1 UMa χ 1 Ori κ 1 Cet β Com Sun β Hyi
610&625 Mg x 6.08 – – – – – – 0.028 –
1032 O vi 5.42 41.3 – 3.1 0.75 0.43 0.16 0.050 0.048
1038 O vi 5.42 20.0 – 1.5 0.38 0.21 0.074 0.025 0.022
630 O v 5.26 – – – – – – 0.037 –
789 O iv 5.05 – – – – – – 0.017 –
1550 C iv 5.00 378.0 – 9.1 2.21 1.02 0.40 0.146 0.082
834 O ii 4.80 – – – – – – 0.015 –
304 He ii 4.75 – – 44.3 8.3 2.3 – 0.260 –
1640 He ii 4.75 180.0 – 6.0 0.99 0.56 – 0.040 –
1400 Si iv 4.75 14.6 – 4.3 1.59 0.77 0.28 0.083 0.097
977 C iii 4.68 58.6 – 5.0 1.22 0.59 0.30 0.150 0.124
1176 C iii 4.68 55.9 – 3.4 0.73 0.37 0.15 0.053 0.046
1206 Si iii 4.40 – – – 1.12 0.75 – 0.095 –
584 He i 4.25 – – – – – – 0.032 –
1335 C ii 4.25 45.2 – 4.7 1.52 0.95 0.36 0.188 0.155
1304 O i 3.85 126.4 – 4.3 1.18 0.60 0.45 0.143 0.163
1657 C i 3.85 29.2 – 4.1 0.97 0.78 0.47 0.202 0.210
1026 H i 3.84 – – – 3.1 0.80 – 0.098 –
1216 H i 3.84 ≈16,000 – – 42.2 29.3 – 6.19 –
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