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Table 1
Spectral parameters of the observed SiO isotopologue transitions.
| Line | Frequency | Eup/k | θ MB | Instrument |
| (MHz) | (K) | (′′) | ||
|
|
||||
| 28SiO υ = 0, J = 6–5 | 260 518.02 | 43.8 | 24.0 | APEX-1 |
| 29SiO υ = 0, J = 6–5 | 257 255.22 | 43.3 | 24.3 | APEX-1 |
| 30SiO υ = 0, J = 6–5 | 254 216.66 | 42.7 | 24.5 | APEX-1 |
| 29SiO υ = 0, J = 7–6 | 300 120.48 | 57.7 | 20.8 | APEX-2 |
| 30SiO υ = 0, J = 7–6 | 296 575.74 | 57.0 | 21.1 | APEX-2 |
| 29SiO υ = 0, J = 26–25 | 1 112 832.94 | 721.6 | 19.8 | HIFI |
| 30SiO υ = 0, J = 26–25 | 1 099 711.49 | 713.1 | 19.6 | HIFI |
Notes. θMB is the FWHM beam width at the observed frequencies. The Kelvin-to-Jansky conversions are 39, 41, and 390 Jy K-1 for the APEX-1, 2, and HIFI observations, respectively.
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