Table 4
Abundances of parent species adopted as input for our chemical kinetics model (see Sect. 6.1).
| Species | C-rich Abundance | O-rich | |
|---|---|---|---|
| Species | Abundances | ||
| He(a) | 0.17 | He(a) | 0.17 |
| CO(b) | 8.0×10−4 | CO(g) | 2.0×10−4 |
| C2H2(c) | 8.0×10−5 | H2O(h) | 2.0×10−4 |
| N2(d) | 4.0×10−5 | N2(d) | 4.0×10−5 |
| HCN(c) | 2.0×10−5 | SO(i) | 1.0×10−6 |
| CH4(e) | 3.5×10−6 | NH3(j) | 7.0×10−7 |
| SiS(c) | 1.0×10−6 | SO2(k) | 5.0×10−7 |
| SiO(c) | 1.2×10−7 | CO2(l) | 3.0×10−7 |
| H2O(f) | 1.0×10−7 | SiS(m) | 2.7×10−7 |
| SiC2(c) | 5.0×10−8 | SiO(n) | 1.7×10−7 |
Notes. Column (1): parent species (C-rich), Col. (2): initial abundance relative to H2 (C-rich), Col. (3): parent species (O-rich), Col. (4): initial abundance relative to H2 (O-rich). (a) Solar abundance (see Asplund et al. 2009), (b)Knapp & Morris (1985), (c)Agúndez (2009), (d)TE abundance (see Agündez et al. 2010), (e)Keady & Ridgway (1993), (f)Decin et al. (2010a), (g)Bujarrabal et al. (1989), (h)Maercker et al. (2008) scaled to CO abundance, (i)Bujarrabal et al. (1994), (j) Wong et al. (2018), (k)Massalkhi et al. (2020), (l)Tsuji et al. (1997), (m)Schöier et al. (2007), (n)Schöieretal. (2006).
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