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Table 5
Chemistry of the envelopes around binary post-AGB stars observed in this paper.
| Source | Chemistry | Comments |
|---|---|---|
| AC Her | O-rich | Tentative SiO maser emission |
| Red Rectangle | O-rich | See Fig. 15 and Sect. 5.4 |
| 89 Herculis | C-rich | See Fig. 15 |
| HD 52961 | O-rich | See Gielen et al. (2011b) |
| AI CMi | O-rich | See Fig. 15 |
| SiO, H2O and OH maser emission | ||
| See Arkhipova et al. (2017) | ||
| IRAS 20056+1834 | O-rich | SiO maser emission |
| R Scuti | O-rich | See Fig. 15 |
| SiO and H2O maser emission | ||
| H2O emission in IR spectra |
Notes. We did not detect any thermal emission of O-bearing molecules in AC Her and IRAS 20056+1834, but we detected SiO maser emission (see Sects. 4.1 and 4.8). HD 52961 is cataloged as O-rich, based on discussions by Gielen et al. (2011b).
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