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Table 1.

Key optical lines to spectral classification of CSPNe.

Ion/wavelength [Å]
Spectral Example H I He I C III C III He II He II C IV C IV N V N V O VI O VI
classif. 4340 4471 4649 5696 4686 5412 5806 4650 4603 4945 3822 5290
Early O(H) NGC 5307 A A A A E A E? E
Late O(H) Cn 3−1 A A A A A A
Early Of(H) M 1−53 A A E E A E A ? E
Late Of(H) IC 4593 A A A E A ? ?
Of-WR(H) NGC 6543 A ? E (1) E E E E
O(He) Hen 2−64 A A E E
PG 1159 Jn 1 A A E A E E

[WO] NGC 2867 E E E E E E
[WC] NGC 40 E E E E E
[WN] IC 4663 E E E E E
DA DeHt 5 A
DO KPD (2) A A A

Notes. The A represents absorption lines, while the E represents the emission ones. Upper panel represents narrow features, and lower, wide features. The ions are arranged by excitation potential. In the second column we propose a prototype with published spectrum. (1)Wide line. (2)KPD 0005+5106.

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