Table C.1
Comparison between the empirically estimated molecular column densities derived from the radiative transfer analysis (Sect. 5) and those predicted by the chemical kinetics models (Sect. 6).
| Molecule | empirically estimated (cm−2) | model-x/uv (cm−2) | model-x (cm−2) | model-std (cm−2) | model-uv (cm−2) |
|---|---|---|---|---|---|
| T Dra (C-rich with X-rays) - smooth model- | |||||
| CO | 2.7×1018 | 6.8×1018 | 6.8×1018 | 1.3×1019 | 1.3×1019 |
| HCN | 1.3×1018 | 3.4×1017 | 3.4×1017 | 3.1×1017 | 3.1×1017 |
| HC3N | 1.7×1017 | 2.6×1015 | 2.6×1015 | 2.5×1015 | 2.5×1015 |
| SiO | 3.5×1016 | 3.0×1015 | 3.0×1015 | 1.9×1015 | 1.9×1015 |
| SiC2 | 2.1×1016 | 2.7×1015 | 2.7×1015 | 1.4×1015 | 1.4×1015 |
| C2H | 8.2×1015 | 2.8×1015 | 2.8×1015 | 7.4×1015 | 7.4×1015 |
| SiS | 3.1×1015 | 4.7×1015 | 4.7×1015 | 1.5×1016 | 1.5×1016 |
| HNC | 2.8×1015 | 1.2×1016 | 1.2×1016 | 3.4×1013 | 3.4×1013 |
| HCO+(2024) | 4.9×1014 | 1.3×1015 | 1.3×1015 | 5.6×1011 | 5.6×1011 |
| HCO+(2020) | 2.4×1014 | — | — | — | — |
| N2H+ | <4.8×1014 | 5.1×1013 | 5.1×1013 | 3.2×109 | 3.2×109 |
| T Dra (C-rich with X-rays) - porous model- | |||||
| CO | 2.7×1018 | 7.6×1018 | 6.7×1018 | 1.3×1019 | 1.3×1019 |
| HCN | 1.3×1018 | 1.1×1018 | 3.5×1017 | 3.1×1017 | 1.1×1018 |
| HC3N | 1.7×1017 | 2.2×1016 | 2.4×1015 | 3.1×1015 | 6.3×1015 |
| SiO | 3.5×1016 | 2.5×1015 | 2.8×1015 | 1.8×1015 | 1.3×1013 |
| SiC2 | 2.1×1016 | 8.3×1015 | 2.7×1015 | 1.7×1015 | 7.6×1015 |
| C2H | 8.2×1015 | 4.7×1015 | 1.6×1015 | 4.2×1015 | 1.8×1015 |
| SiS | 3.1×1015 | 1.7×1014 | 4.5×1015 | 1.5×1016 | 3.2×1014 |
| HNC | 2.8×1015 | 4.4×1015 | 9.9×1015 | 4.1×1013 | 7.9×1014 |
| HCO+(2024) | 4.9×1014 | 5.5×1014 | 7.3×1014 | 3.7×1011 | 8.3×1011 |
| HCO+(2020) | 2.4×1014 | — | — | — | — |
| N2H+ | <4.8×1014 | 4.4×1012 | 2.6×1013 | 1.9×109 | 5.8×108 |
| EY Hya (O-rich with X-rays)-smooth model- | |||||
| CO | 1.2×1018 | 6.5×1017 | 5.1×1017 | 1.2×1018 | 1.2×1018 |
| SiO | 1.19×1015 | 3.0×1014 | 5.2×1014 | 9.7×1014 | 4.5×1014 |
| HCO+ | <5.9×1014 | 3.8×1014 | 3.8×1014 | 1.8×1013 | 1.7×1013 |
| VY Uma (C-rich without X-rays)-smooth model- | |||||
| CO | 3.6×1018 | – | – | 3.6×1018 | 3.6×1018 |
| HCN | 6.1×1015 | – | – | 8.4×1016 | 6.2×1016 |
| HCO+ | <2.3×1014 | – | – | 1.8×1011 | 4.6×1011 |
| V Eri (O-rich without X-rays)-smooth model- | |||||
| CO | 1.1×1018 | – | – | 1.0×1018 | 1.0×1018 |
| SiO | 1.0×1015 | – | – | 8.4×1014 | 5.6×1014 |
| HCO+ | <1.6×1015 | – | – | 2.1×1014 | 2.0×1014 |
Notes. Column (1): Molecule, Col. (2): empirically estimated column densities from the radiative transfer modelling (see Sect. 5), Col (3): Column densities estimated for the chemical kinetics model-x/uv, Col (4): same for model-std, Col (5): same for model-uv, Col (6): same for model-x.).
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