Table 2
Overview of the different characteristics of post-AGB disc sources with evidence for carbonaceous molecules from the list given by De Ruyter et al. (2006) and Gielen et al. (2011).
| Name | Spec. Type | Teff (K) | C/O | LIR/L∗ | Am. Sil. | Cryst. Sil. | PAHs | C60 | CO2 |
|
|
|||||||||
| EP Lyr | A4I | 7000 | <1 | 3% | no/weak | strong | class C | no | yes |
| IRAS 06338 | F3I | 6250 | <1 | 3% | yes | weak | class (B)C | yes | yes |
| HD 52961 | F6I | 6000 | <1 | 12% | yes | weak | class C | yes | yes |
| HR 4049 | A6I | 7500 | <1 | 25% | no | no | class B | no | yes |
| IRAS 13258 | F4Ib-G0Ib | ? | ? | > 50% | ? | strong | class C | no | no |
| Red rectangle | F1I | 7500 | ≤ 1 | > 100% | no | strong | class B | no | no |
Notes. We list the name, spectral type, effective temperature, C/O ratio, the LIR/L∗ ratio, the presence of amorphous and/or crystalline silicates, the detection of PAHs and/or C60, and the presence of CO2 gas lines in their infrared spectra.
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