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Table 2

Atomic parameters of selected spectral lines.

Line λ [nm] χ [eV] log  T [K] Reference

C ii 133.4532 1.264 4.20−4.65 1, 2
Ni ii 133.5201 0.187 4.00−4.25 3, 4
C ii 133.5708 1.264 4.20−4.65 1, 2
O i 135.5598 0.000 4.00−4.15 1, 5
C i 135.5844 1.264 4.00−4.10 1, 2

Si iv 139.376 0.000 4.05−4.25 3, 6
Ni ii 139.902 0.187 4.00−4.25 3, 4
O iv 139.978 0.000 4.05−4.25 3, 6
Fe ii 139.9957 2.778 4.05−4.25 1, 7
O iv 140.115 0.048 5.15−5.30 2, 5
S i 140.151 0.000 <4.00 1, 8
Si iv 140.277 0.000 4.75−4.85 1, 9
Fe ii 140.5602 0.232 4.05−4.25 1, 7
S iv 140.481 0.000 4.95−5.05 1, 9
O iv 140.481 0.048 5.15−5.30 3, 6
S iv 140.608 0.117 4.95−5.05 1, 9
O iv 140.738 0.048 5.15−5.30 1, 5

Mg ii k 279.553 0.000 4.0−4.20 1, 10
Mg ii 279.800 4.433 4.0−4.20 1, 10
Ni i 279.865 0.110 <4.00 1, 11
Fe i 283.2435 0.958 <4.00 1, 7

Notes. λ is the observed wavelength in air. χ stands for the excitation potential of the lower level. The formation temperatures are from Sutherland & Dopita (1993). The main spectral lines discussed in the paper are marked with an asterisk.

Reference. 1- Kramida et al. (2015); 2- Moore (1970); 3- Kupka et al. (1999); 4- Kurucz (2003), 5- Moore (1993); 6- Kurucz (2011); 7- Nave et al. (1994); 8- Kaufman (1982); 9- Toresson (1960), 10- Risberg (1955); 11- Meggers et al. (1975).

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