Table 8
Comparison of H ii regions ionized by clusters with the same stellar content (two 35 000 K and three 30 000 K stars with solar metallicity), but different spatial distributions of the stars.
| Dense cluster | Sparse cluster | ||||||||||||||||
| integrated ionization fractions in % | |||||||||||||||||
|
|
|||||||||||||||||
| I | II | III | IV | I | II | III | IV | ||||||||||
| H | 91.5 | 8.5 | 90.0 | 10.0 | |||||||||||||
| He | 95.9 | 4.1 | 0.0 | 95.1 | 4.9 | 0.0 | |||||||||||
| C | 0.0 | 97.9 | 2.1 | 0.0 | 0.0 | 97.9 | 2.3 | 0.0 | |||||||||
| N | 90.9 | 7.0 | 2.1 | 0.0 | 89.1 | 8.6 | 2.3 | 0.0 | |||||||||
| O | 90.9 | 8.1 | 1.0 | 0.0 | 89.2 | 9.7 | 1.1 | 0.0 | |||||||||
| Ne | 91.4 | 8.4 | 0.1 | 0.0 | 90.2 | 9.7 | 0.1 | 0.0 | |||||||||
| S | 0.0 | 93.7 | 6.2 | 0.1 | 0.0 | 93.4 | 6.4 | 0.1 | |||||||||
| total line emission in 1037 erg s-1 | |||||||||||||||||
| Hα | 1.80 | 1.80 | |||||||||||||||
| [N ii] | 0.42 | 0.44 | |||||||||||||||
| [O ii] | 0.52 | 0.54 | |||||||||||||||
| [O iii] | 0.06 | 0.07 | |||||||||||||||
| max. line strength in 108 photons s-1 sr-1 cm-2 | |||||||||||||||||
| Hα | 8.49 | 7.92 | |||||||||||||||
| [N ii] | 1.66 | 1.30 | |||||||||||||||
| [O ii] | 1.19 | 1.00 | |||||||||||||||
| [O iii] | 0.43 | 0.49 | |||||||||||||||
Notes. In the first case, the distances between the stars are small when compared to the size of the Strömgren sphere. In the second case, the distances between the sources are similar to the diameters of the ionized volumes.
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