Table 1
Molecular inventory of W Aql from HIFI observations.
| Molecule | Transition | Frequency | E up | η mb | I mb | θ | I model / I mb |
| [GHz] | [K] | [K km s-1] | [′′] | ||||
|
|
|||||||
| CO | 6 → 5 | 691.473 | 116 | 0.75 | 14.1 | 30.7 | 1.03 |
| 10 → 9 | 1151.985 | 304 | 0.64 | 14.7 | 18.4 | 1.10 | |
| 16 → 15 | 1841.345 | 752 | 0.70 | 15.9 | 11.5 | 1.01 | |
| 13CO | 6 → 5 | 661.067 | 111 | 0.75 | 1.3 | 32.1 | 0.87 |
| 10 → 9 | 1101.349 | 291 | 0.74 | 0.95 | 19.3 | 1.03 | |
| o-H2O | 11,0 → 10,1 | 556.936 | 61 | 0.75 | 2.0 | 38.1 | 0.68 |
| 31,2 → 30,3 | 1097.365 | 250 | 0.74 | 2.2 | 19.3 | 1.50 | |
| 31,2 → 22,1 | 1153.127 | 250 | 0.64 | 3.7 | 18.4 | 1.40 | |
| 32,1 → 31,2 | 1162.911 | 306 | 0.64 | 1.8 | 18.2 | 0.68 | |
| p-H2O | 11,1 → 00,0 | 1113.343 | 53 | 0.64 | 4.4 | 19.1 | 0.87 |
| HCN | 13 → 12 | 1151.452 | 387 | 0.64 | 3.5 | 18.4 | 1.03 |
| H13CN | 8 → 7 | 690.551 | 149 | 0.75 | 0.63 | 30.7 | 1.00 |
| SiO | 16 → 15 | 694.294 | 284 | 0.75 | 1.1 | 30.6 | 1.07 |
| 29SiO | 13 → 12 | 557.179 | 187 | 0.75 | 0.25 | 38.1 | 1.00 |
| o-NH3 | 10 → 00 | 572.498 | 27 | 0.75 | 0.85 | 37.1 | 1.06 |
Notes. Eup is the excitation energy of the upper transition level, ηmb is the main beam efficiency (see Eq. (1)), Imb is the integrated intensity (uncertainties are taken to be 20%), θ is the full-width half-power beam width, and Imodel/Imb is the ratio of modelled to observed integrated intensities.
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