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Table 4

Column densities (Ntot), rotational temperatures (Trot), and fractional abundances relative to H2 (X) for the molecules detected in OH 231.8+4.2 as derived using the population diagram method (Sect. 4.1) and from non-LTE excitation analysis (Sect. 4.2).

Molecule N tot T rot X
(cm-2) (K)
(i) LTE RESULTS
13CO 2.6(0.3) × 1017 16(1) 5 × 10-5†
HNCO 5.7(0.7) × 1014 27(1) 1 × 10-7
HNCS 7.2(1.2) × 1013 23(2) 1 × 10-8
HC3N 3.5(0.5) × 1013 17(1) 7 × 10-9
NO 8.8(0.7) × 1015 22(2) 2 × 10-6
(ii) NON-LTE RESULTS‡
HNCO [4.0–5.2] × 1014 [26–28] [0.8–1] × 10-7
HNCS [4.9–7.4] × 1013 [23–28] [0.9–1] × 10-8
HC3N [2.4–3.3] × 1013 [45–55] [5–6] × 10-9
NO [7.5–8.9] × 1015 [28–33] [1–2] × 10-6

Notes. The characteristic angular size for the emitting region adopted is Ωs = 4′′× 12′′.

(†)

Adopted based on the estimate of X(13CO) by Morris et al. (1987).

(‡)

In this case, we provide ranges of column densities, abundances, and kinetic temperatures consistent with the observations obtained from our non-LTE excitation analysis adopting n(H2) = 105 cm-3, for HNCS, HC3N and NO, and n(H2) = 4 × 107 cm-3, for HNCO (see Sect. 4.2 and Appendix A).

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