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 | – | – | – | – | – | – | – | – | – | – | – |
| DAO | HDW 3 | A | – | – | – | 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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