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Table 1
Properties derived from the integrated spectrum and recalculated using line ratio values from published data.
| Line ratio/property | Integrated | M13 | V92 | R90 | D86 | O73a |
|
|
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| [S ii] λ6716 /λ6731 | 0.861 | – | 0.743 | 0.767 | 0.861 | 0.905 |
| Ne([S ii]) (cm-3) | 1100 | 600–3500b | 1800c | 1600 | 1000 | 800 |
| [S ii] λλ6716,31 /λ4068,76 | 7.856 | – | – | 5.876 | 8.443 | 10.03 |
| Te([S ii]) (K) | 9600 | – | – | 10 600 | 9100 | 8500 |
| [O iii] λλ5007,4959 /λ4363 | 19.272 | – | – | 15.61 | 10.49d | 20.80 |
| Te([O iii]) (K) | 36 700 | – | – | 48 400 | >105 | 33 900 |
| [O ii] λ3727 /λλ7320,30 | 19.646 | – | – | 15.8 | 18.05 | – |
| Te([O ii]) (K) | 12 200 | – | – | 12 200 | 13 100 | – |
| [N ii] λλ6583,84 /λ5755 | 57.526 | – | 55.69 | 144.3 | 107.0 | – |
| Te([N ii]) (K) | 12 600 | – | 12 600 | 8500 | 9600 | – |
| Hα/Hβ | 3.452 | – | 4.36 | 5.97 | 4.40 | 2.96 |
| c(Hα/Hβ)3.00e | 0.202 | – | 0.539 | 0.992 | 0.552 | – |
| Hγ/Hβ | 0.401 | – | – | 0.414 | 0.340 | 0.52 |
| c(Hγ/Hβ)0.47e | 0.502 | – | – | 0.406 | 0.996 | – |
| Hδ/Hβ | 0.215 | – | – | 0.231 | 0.138 | 0.36 |
| c(Hδ/Hβ)0.26e | 0.382 | – | – | 0.243 | 1.237 | – |
Notes.
Reference. M13: Melnik & Copetti (2013); V92: Vancura et al. (1992); R90: Russell & Dopita (1990); D86: Dennefeld (1986), O73: Osterbrock & Dufour (1973).
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