Table 1
IC 418 ring-like features with de-reddened emission line intensities.
| Ion | λ0 (Å) | Iλ |
|---|---|---|
| Hβ | 4861 | 100.00 ± 0.27 |
| He I | 4921 | 1.05 ± 0.02 |
| [O III] | 4959 | 51.65 ± 0.17 |
| [O III] | 5007 | 153.06 ± 0.38 |
| He I | 5016 | 2.22 ± 0.03 |
| Si II * | 5041.2 | 0.28 ± 0.01 |
| He I * | 5047.9 | 0.19 ± 0.01 |
| Si II * | 5056.1 | 0.21 ± 0.01 |
| [Ni V] | 5132 | 0.10 ± 0.02 |
| C II | 5146.2 | 0.16 ± 0.02 |
| [N I] | 5199 | 2.38 ± 0.02 |
| [Fe II] * | 5262 | 0.12 ± 0.01 |
| O I blend | 5270.8+5274.7 | 0.22 ± 0.02 |
| O I | 5299 | 0.16 ± 0.01 |
| O I | 5513 | 0.11 ± 0.02 |
| [Cl III] | 5517 | 0.19 ± 0.02 |
| [Cl III] | 5537 | 0.36 ± 0.02 |
| N II * | 5667 | 0.04 ± 0.01 |
| [Fe VI] | 5677 | 0.07 ± 0.01 |
| Si I ? | 5696 | 0.10 ± 0.01 |
| [N II] | 5755 | 2.96 ± 0.01 |
| He I | 5876 | 10.63 ± 0.01 |
| O I * | 5959 | 0.19 ± 0.01 |
| He II | 5977 | 0.16 ± 0.01 |
| 6047 | 6047 | 0.34 ± 0.01 |
| [O I] | 6300 | 4.22 ± 0.01 |
| [S III] | 6312 | 0.84 ± 0.01 |
| Si II * | 6347 | 0.20 ± 0.01 |
| [O I] | 6363 | 1.45 ± 0.01 |
| Si II * | 6372 | 0.18 ± 0.01 |
| [N II] | 6548 | 56.50 ± 0.12 |
| Hα | 6563 | 285.85 ± 0.56 |
| [N II] | 6584 | 173.38 ± 0.34 |
| He I | 6678 | 3.03 ± 0.01 |
| [S II] | 6717 | 2.84 ± 0.01 |
| [S II] | 6731 | 5.31 ± 0.01 |
| [Ar V] | 7005 | 0.33 ± 0.01 |
| He I | 7065 | 5.42 ± 0.01 |
| [Ar III] | 7135 | 6.45 ± 0.01 |
| [O II] | 7320 | 14.60 ± 0.51 |
| [O II] | 7330 | 11.80 ± 0.45 |
| [Ar III] | 7752 | 1.35: |
| O I | 8447 | 3.23 ± 0.57 |
| [S III] | 9070 | 13.82 ± 1.01 |
| H P9 | 9229 | 2.70 ± 0.1 |
| logF(Hβ) | −14.93 ± 0.01 |
Notes. The value of 0.17 ± 0.03 computed for c(Hβ) from the Hα to Hβ line ratio has been adopted to underedden the line intensities. Intensities are normalized to a value of 100 for the Hβ emission line. Unusual species with a relative intensity lower than 1% of Hβ are marked by a “*” sign. The identification of the emission line at 5696 Å with a transition of Si I should be considered tentative.
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