Table 1
Spectral parameters of the analysed transitions.
| Mol. | Transition | Rest freq. (GHz) | log[Aij] (s−1) | Eup (K) |
|---|---|---|---|---|
| PN | N = 2−1, J = 2−2 | 93.9782 | −5.6144 | 6.8 |
| N = 2−1, J = 1−0 | 93.9785 | −5.2677 | 6.8 | |
| N = 2−1, J = 2−1 | 93.9798 | −5.1373 | 6.8 | |
| N = 2−1, J = 3−2 | 93.9799 | −5.0123 | 6.8 | |
| N = 2−1, J = 1−2 | 93.9808 | −6.5687 | 6.8 | |
| N = 2−1, J = 1−1 | 93.9823 | −5.3926 | 6.8 | |
| PO | J = 5/2 − 3/2, | |||
| Ω = 1/2, | ||||
| F = 3−2, l = e | 108.9984 | −4.6712 | 8.4 | |
| F = 2−1, l = e | 109.0454 | −4.7160 | 8.4 | |
| F = 3−2, l = f | 109.2062 | −4.6689 | 8.4 | |
| F = 2−1, l = f | 109.2812 | −4.7143 | 8.4 | |
| SiO | J = 2−1 | 86.8470 | −4.5335 | 6.3 |
| J = 5−4(a) | 217.1050 | −3.2843 | 31.3 | |
| 29SiO | J = 2−1 | 85.7592 | −4.5500 | 6.2 |
| SiS | J = 5−4 | 90.7716 | −4.9241 | 13.1 |
| J = 6−5 | 108.9243 | −4.6799 | 18.3 | |
| SO(b) | N = 2−1, J = 2−1 | 86.0940 | −5.2799 | 19.3 |
| N = 3−2, J = 2−1 | 99.2999 | −4.9488 | 9.2 | |
| N = 4−4, J = 5−4 | 100.0296 | −5.9656 | 38.6 | |
| N = 2−1, J = 3−2 | 109.2522 | −4.9665 | 21.1 | |
| 34SO(b) | N = 2−1, J = 2−1 | 84.4107 | −5.3056 | 19.2 |
| N = 4−4, J = 5−4 | 96.7818 | −6.0061 | 38.1 | |
| N = 3−2, J = 2−1 | 97.7153 | −4.9695 | 9.1 | |
| N = 2−1, J = 3−2 | 106.7432 | −4.9970 | 20.9 | |
| 33SO(c) | N = 2−1, J = 2−1 | 85.2379 | −5.2928 | 19.3 |
| N = 3−2, J = 2−1 | 98.4936 | −4.9591 | 9.1 | |
| SO2(d) |  |
104.0294 | −4.2264 | 7.7 |
 |
104.0336 | −5.4987 | 138 | |
 |
104.2393 | −3.7708 | 55 |
Notes. All parameters are taken from the Cologne Database for Molecular Spectroscopy (CDMS: https://cdms.astro.uni-koeln.de/cdms/portal/; Endres et al. 2016) (a) From observations in Beltrán et al. (2022). (b) For simplicity, in the text and figures, we label the SO and 34SO transitions only with the N quantum number. We add the J of the upper level for the two transitions with the same N quantum numbers. (c) We list only the two (expected-to-be) strongest hyperfine transitions, F = 7/2 − 5/2 and F = 9/2 − 7/2. (d) We list only the lines detected towards the PN-emitting regions.
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