PDRs4All - XVII. Formation and excitation of HD in photodissociation regions: Application to the Orion Bar

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Table 1

Fiducial model parameters.

Parameters	Value
P (K cm⁻³)	5 × 10⁷
d_* (pc)	0.5
G₀	1.37 × 10⁴
A_V	30
ζ (s⁻¹)	10⁻¹⁶
v_t (km s⁻¹)	2
R_V	5.5
$\frac{N_{H}}{E_{B - V}} ({c m}^{- 2})$ $\[\frac{N_{\mathrm{H}}}{E_{\mathrm{B}-\mathrm{V}}}\left(\mathrm{cm}^{-2}\right)\]$	1.57 × 10²²
Dust to gas mass ratio	10⁻²
Grain distribution	proportional to a^−3.5
minimum grain radius a_min	0.003 μm
maximum grain radius a_max	0.3 μm

Notes. A_V stands for the total visual extinction of the PDR. ζ stands for the cosmic ionization rate of H₂.

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