Table 2
Parent species and their initial abundances relative to H2 for the C- and O-rich CSE.
| Carbon-rich | Oxygen-rich | |||||
|---|---|---|---|---|---|---|
| Species | Abundance | Ref. | Species | Abundance | Ref. | |
| He | 0.17 | He | 0.17 | |||
| CO | 8 × 10−4 | (1) | CO | 3 × 10−4 | (1) | |
| N2 | 4 × 10−5 | (2) | N2 | 4 × 10−5 | (2) | |
| C2H2 | 8 × 10−5 | (3) | H2O | 3 × 10−4 | (4) | |
| HCN | 2 × 10−5 | (3) | CO2 | 3 × 10−7 | (5) | |
| SiO | 1.2 × 10−7 | (3) | SiO | 1.7 × 10−7 | (6) | |
| SiS | 1 × 10−6 | (3) | SiS | 2.7 × 10−7 | (7) | |
| CS | 5 × 10−7 | (3) | SO | 1 × 10−6 | (8) | |
| SiC2 | 5 × 10−8 | (3) | H2S | 7 × 10−8 | (9) | |
| HCP | 2.5 × 10−8 | (3) | PO | 9 × 10−8 | (10) | |
Notes. Taken from Agúndez et al. (2010). References. (1) Teyssier et al. (2006); (2) TE abundance (Agúndez et al. 2010); (3) Agundez (2009); (4) Maercker et al. (2008); (5) Tsuji et al. (1997); (6) Schöier et al. (2006); (7) Schöier et al. (2007); (8) Bujarrabal et al. (1994); (9) Ziurys et al. (2007); (10) Tenenbaum et al. (2007).
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