Table 7
H/D ratios of C-containing molecules observed in L483 and steady-state values calculated with our gas-phase chemical model.
| Molecular ratio | L483 | Model 1 | Model 2 | Model 3 |
|---|---|---|---|---|
| OPR H2 | 10−3 | 10−4 | 10−4 | |
| ζ (10−17 s−1) (a) | 1.3 | 1.3 | 0.5 | |
| CH3CCH/CH2DCCH | 5.2 (b) | 10.1 | 7.6 | 6.3 |
| CH3CCH/CH3CCD | 15.7 (b) | 27.3 | 20.4 | 17.1 |
| CH3CCH/CHD2CCH | 33.8 (b) | 91.1 | 56.0 | 38.0 |
| CH3CCH/CH2DCCD | 42.1 (b) | 131.5 | 78.4 | 54.5 |
| c-C3H/c-C3D | 22.7 (c) | 18.2 | 15.4 | 12.8 |
| c-C3H2/c-C3HD | 9.8 (c) | 13.4 | 13.1 | 11.1 |
| c-C3H2/c-C3D2 | 103 (c) | 173 | 130 | 95.5 |
| l-C3H2/l-C3HD | 13.2 (c) | 7.0 | 6.5 | 5.4 |
| C4H/C4D | 52.6 (c) | 13.0 | 9.7 | 8.9 |
| HC3N/DC3N | 35.7 (c) | 14.1 | 10.8 | 9.0 |
| CH3CN/CH2DCN | 7.6 (c) | 18.2 | 15.4 | 13.8 |
Notes. See text for the assumed physical conditions. We adopted the elemental abundance ratios O/H = 8 × 10−6, D/H = 1.5 × 10−5, C/O = 0.5, and C/N = 4. (a)Cosmic-ray ionization rate of H2. (b) Observed values in this work (see Table 3). (c)Observed values from Agúndez et al. (2019).
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