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Table 2.
Occurrence of the 13 μm feature in the sample stars observed by ISO.
| Object | Tc | Sp. | Var. | Period | K − [22] | 13 μm |
|---|---|---|---|---|---|---|
| name | type | type | (d) | feature | ||
| R Dor | 0 | M | SRV | 327.1 | 1.290 | y |
| RX Lac | 1 | MS | SRV | 331.4 | 1.295 | y |
| T Cet | 1 | MS | SRV | 159.3 | 1.444 | y |
| T Cep | 1 | M | Mira | 386.6 | 1.756 | y |
| R Hya | 1 | M | Mira | 376.6 | 1.770 | y |
| W Hya | 0 | M | Mira? | 388.6 | 1.987 | y |
| ST Her | 1 | MS | SRV | 147.0 | 1.999 | y |
| S Vir | 1 | M | Mira | 370.4 | 2.077 | y |
| NO Aur | 1 | MS | SRV | 102.1 | 2.110 | n |
| R Cen | 0 | M | Mira | 538.1 | 2.221 | y |
| π1 Gru | 1 | S | SRV | 198.8 | 2.253 | n |
| χ Cyg | 1 | S | Mira | 408.2 | 2.266 | n |
| R Aql | 0 | M | Mira | 270.6 | 2.660 | n |
| R And | 1 | S | Mira | 409.9 | 2.861 | n |
| o Cet | 1 | M | Mira | 332.7 | 3.479 | n |
| R Aqr | 1 | M | Mira | 388.2 | 3.531 | n |
| RR Aql | 0 | M | Mira | 399.8 | 3.565 | n |
Notes. The presence of the 13 μm feature reported in the last column is taken from Sloan et al. (2003b). The stars are ordered by increasing K − [22] colour.
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