Table 3
Parameters of the radiative transfer models.
| Model | nH | R∗ | T∗ | Ri | RS |
|
ne/nH | Te | Eion | Eheat |
| (cm-3) | (R⊙) | (kK) | (pc) | (pc) | (erg cm-3 s-1) | (K) | (erg s-1) | (erg s-1) | ||
|
|
||||||||||
| photoionized nebulae | ||||||||||
| A4 | 10 | 19 | 40 | 1 | 21 | 0 | 1.1 | ~8000 | 1.3 × 1039 | 0 |
| B4 | 1 | 19 | 40 | 1 | 99 | 0 | 1.1 | ~8000 | 1.3 × 1039 | 0 |
| C4 | 0.1 | 19 | 40 | 1 | 465 | 0 | 1.1 | ~8000 | 1.3 × 1039 | 0 |
| B3 | 1 | 19 | 30 | 1 | 56 | 0 | 1.1 | ~7400 | 2.2 × 1038 | 0 |
|
|
||||||||||
| thermally excited nebulae | ||||||||||
| B4a | 1 | 19 × 10-3 | 40 | 1 | 99 | 6.4 × 10-23 | 0.52 | 15 000 | 1.3 × 1033 | 7.6 × 1039 |
| B4b | 1 | 19 × 10-3 | 40 | 1 | 99 | 6.6 × 10-26 | 0.0045 | 10 000 | 1.3 × 1033 | 7.9 × 1036 |
| B4c | 1 | 19 × 10-3 | 40 | 1 | 99 | 6.7 × 10-29 | 0.00035 | 3700 | 1.3 × 1033 | 8.0 × 1033 |
| C4a | 0.1 | 19 × 10-3 | 40 | 1 | 465 | 1.6 × 10-20 | – | – | 1.3 × 1033 | 2.0 × 1044 |
| C4b | 0.1 | 19 × 10-3 | 40 | 1 | 465 | 1.7 × 10-23 | – | – | 1.3 × 1033 | 2.1 × 1041 |
| C4c | 0.1 | 19 × 10-3 | 40 | 1 | 465 | 1.3 × 10-26 | 0.039 | 12 000 | 1.3 × 1033 | 1.6 × 1038 |
|
|
||||||||||
| photoionized and thermally excited nebulae | ||||||||||
| B4a1 | 1 | 19 | 40 | 1 | 155 | 6.4 × 10-23 | 1.1 | ~25 000 | 1.3 × 1039 | 2.9 × 1040 |
| B3a1 | 1 | 19 | 30 | 1 | 85 | 6.4 × 10-23 | 1.1 | ~25 000 | 2.2 × 1038 | 4.8 × 1039 |
Notes. R∗ and T∗ refer to the radius and the effective temperature of the central ionizing source, nH, Ri, and RS to the total hydrogen density of the nebula, the radius of the inner nebular “cavity”, and the Strömgren radius of the ionized bubble. is the additional heating rate, ne/nH the resulting relative electron density of the gas, and Te the resulting nebular equilibrium temperature. Eion is the total ionizing energy emitted by the central source per unit time, and Eheat the total energy per unit time deposited via heating within the ionized region.
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