Table 1
Input parameters of the Meudon PDR code (Le Bourlot et al. 2012) used to model the physical and chemical structure of NGC 7023 NW PDR.
| Parameters | Values | Units | |
|
|
|||
| Star surface temp. | T eff | 15 000 | K |
| UV radiation field | G 0 | 2600 | Habing† |
| Fixed pressure | P | 7 × 106 | K cm-3 |
| AV/EB − V | R V | 5.56 | |
|
|
|||
| x 0 | 4.60 | μm-1 | |
| Extinction curve with | γ | 1.36 | μm-1 |
| Fitzpatrick & Massa | c 1 | 0.80 | |
| parameters | c 2 | 0.32 | μm |
| for HD 200775 | c 3 | 3.09 | μm-2 |
| c 4 | 0.37 | ||
|
|
|||
| CR ionization rate | ζ | 5 × 10-17 | s-1 |
| Dust minimum radius | a min | 3 × 10-7 | cm |
| Dust maximum radius | a max | 3 × 10-5 | cm |
| MRN distribution index | α | 3.5 | |
Notes.
The fluxes are normalised by the flux of the interstellar radiation field between 912 and 2400 Å measured by Habing (1968) in the ~1 kpc neighbourhood of the Sun.
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