Table 7
Results of RATRAN models of fractional abundances of certain molecules in R CrA IRS7B and similar modelling results from the literature for other protostellar sources.
| IRS7B | I16293a | Class 0b | Class Ib | Prestellarb | ||
| Molecule | abundance |
|
abundance | abundance | abundance | abundance |
|
|
||||||
| COc | 1.4 × 10-4 | ... | 3.3 × 10-5 | 2.1 × 10-5 | 1.1 × 10-4 | 1.4 × 10-5 |
| C17O | 5.7 × 10-8 | 6.9 | 1.6 × 10-8 | ... | ... | ... |
| C18O | 3.2 × 10-7 | ... | 6.2 × 10-8 | ... | ... | ... |
| HCO+c | 3.8 × 10-9 | ... | 1.4 × 10-9 | 2.2 × 10-9 | 1.1 × 10-8 | 8.0 × 10-10 |
| HC18O+ | 6.8 × 10-12 | 3.6 | 6.4 × 10-12 | ... | ... | ... |
| SO | 1.9 × 10-9 | 33.6 | 4.4 × 10-9 | 2.0 × 10-9 | 2.3 × 10-9 | 1.5 × 10-9 |
| CSc | 6.7 × 10-9 | ... | 3.0 × 10-9 | 1.5 × 10-9 | 4.3 × 10-9 | 1.8 × 10-9 |
| 13CS | 8.8 × 10-11 | ... | ... | ... | ... | ... |
| C34S | 2.1 × 10-10 | 16.2 | 1.2 × 10-10 | ... | ... | ... |
| C33S | 6.8 × 10-11 | ... | ... | ... | ... | ... |
| CN outerd | 4.5 × 10-9 | 8.5 | 8.0 × 10-11 | 6.9 × 10-10 | 3.0 × 10-9 | 4.8 × 10-9 |
| CN innerd | < 1 × 10-9 | |||||
| DCN | 7.2 × 10-11 | 14.1 | 1.3 × 10-11 | 1.4 × 10-11 | ... | 7.7 × 10-12 |
| DNC | 6.8 × 10-11 | ... | 4.2 × 10-12 | ... | ... | ... |
| HNCO | 1.2 × 10-10 | 0.002 | 1.3 × 10-10 | ... | ... | ... |
| HC3N | 3.3 × 10-9 | 11.2 | 1.5 × 10-10 | 3.5 × 10-10 | 3.1 × 10-9 | 8.2 × 10-10 |
| c-C3H2 | 3.0 × 10-10 | 12.9 | 1.6 × 10-11 | ... | ... | ... |
Notes. The reduced-χ2 values for IRS7B assume a 10% calibration error and can only be computed for species with at least two spectral lines.
IRAS 16293-2422, Schöier et al. (2002).
Average of sources in Jørgensen et al. (2004).
The abundances for these optically thick species have been calculated from the optically thin isotopologues assuming local ISM isotope ratios (Wilson 1999; Chin et al. 1996).
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