Vibrationally excited HCN transitions in circumstellar envelopes of carbon-rich AGB stars

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Table 7

Column densities and excitation temperatures derived from the population diagram method.

Source (1)	θ_s (″) (2)	T_e (Κ) (3)	N_tot (cm⁻²) (4)
IRC +10216	0.20	946 ±282	(1.2 +0.9) × 10¹⁹
CRL 3068	0.02	830 ± 163	(10.8+4.3) ×10¹⁹
II Lup	0.04	700	(1.7 ± 0.1) × 10¹⁹
W Ori	0.06	700	(1.8 ± 0.1) × 10¹⁸
S Aur	0.02	700	(3.3 ±0.4) ×10¹⁹
RAFGL 4211	0.03	700	(5.2 ± 0.1) × 10¹⁹

Notes. (1) Source name. (2) Assumed source size. (3) Excitation temperature. The excitation temperature is fitted for IRC +10216 and CRL 3068, while the excitation temperature assumed to be 700 Κ for the other sources. (4) Source-averaged HCN column density.

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