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Table 2

Observational results for the CO isotopologue line detections.

Source Line νtrans Imb Tmb
[GHz] [K km s-1] [mK]

M-stars
GX Mon 17I21 224.714 0.71 31
18I21 219.560 0.88 45
WX Psc 17A21 224.714 0.16 11
18A21 219.560 0.60 15

S-stars
W Aql 17A21 224.714 0.38 19
18A21 219.560 0.31 13
χ Cyg 17I10 112.360 0.12 9.5
18I10 109.782 0.053 2.7
17I21 224.714 0.24 19
18I21 219.560 0.13 10

C-stars
CW Leo 17C21 224.714 1.72 103
18C21 219.560 1.38 121
LL Peg 17A21 224.714 0.39 21
17I21 224.714 0.70 30
18A21 219.560 0.72 39
18I21 219.560 1.11 46
LP And 17I21 224.714 1.39 60
18I21 219.560 0.98 48
RW LMi 17I21 224.714 1.39 52
18I21 219.560 0.98 38
V384 Per 17I21 224.714 0.71 29
18I21 219.560 0.33 13

Notes. Detected lines are labeled by a three-part code representing the isotopologue (17: 12C17O, 18: 12C18O), telescope used (A: APEX, C: CSO, I: IRAM), and transition (e.g., 21 being the J = 2–1 transition).

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