Table 1
Overview of the most important model parameters.
| Model input parameters | ||
|---|---|---|
| He/H | 0.0851 | (1) |
| O/H | 4.47 × 10−4 | (2) |
| C/H | 2.34 × 10−4 | (2) |
| 13 C/H | 3.52 × 106 | (3)a |
| 18 O/H | 8.93 × 10−7 | (4)b |
| N/H | 8.32 × 10−5 | (2) |
| S/H | 7.41 × 10−6 | (2) |
| F/H | 6.68 × 10−9 | (2) |
| Z | 1 | solar metallicity |
| ζCR | 2 × 10−16 s−1 | CR ionization rate (5) |
| RV | 3.1 | visual extinction/reddening (7, 8) |
| σD | 1.75 × 10−21 cm2 | UV dust cross section per H (8) |
| ⟨A(λ)∕AV ⟩ | 3.339 | mean FUV extinction |
| τUV | 3.074 AV | FUV dust attenuation |
| vb | 1 km s−1 | Doppler width |
| n0 | 102,…,7 cm−3 | total surface gas density |
| M | 102 M⊙ | cloud mass |
| χ | 100…,6 | FUV intensity w.r.t. (6)c |
| α | 1.5 | density power law index |
| Rcore | 0.2 Rtot | size of constant density core |
| Ntot ∕AV | 1.62 × 1021 cm−2 | (8) |
Notes. All abundances are given with respect to the total H abundance. (a) Based on a 12 C/13C ratio of 67, (b)based on a 16 O/18O ratio of 500, (c)χ = 1.71 G0 where G0 is the mean ISRF from Draine (1978). References. (1) Asplund et al. (2005), (2) Simon-Diaz & Stasinska (2011), (3) Langer & Penzias (1990), (4) Polehampton et al. (2005), (5) Hollenbach et al. (2012), (6) Draine (1978), (7) Röllig et al. (2013), (8) Weingartner & Draine (2001a).
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