Table 7: Abundance ratios in comet Hale-Bopp relative to carbon monoxide derived in this work and upper limits for the abundance ratios relative to CO of solid acetylene and ethane in NGC 7538:IRS9 derived by Boudin et al. (1998).
Hale-Bopp (this work):

Q(C₂H₂)/Q(CO) = 0.01 $\pm$ 0.001

Q(C₂H₆)/Q(CO) = 0.03 $\pm$ 0.004

Q(C₃H₄)/Q(CO) = 0.008 $\pm$ 0.004

NGC 7538:IRS9 derived by Boudin et al. (1998):

Q(C₂H₂)/Q(CO) $\le$ 0.014

Q(C₂H₆)/Q(CO) $\le$ 0.002

**Table 7:** Abundance ratios in comet Hale-Bopp relative to carbon monoxide derived in this work and upper limits for the abundance ratios relative to CO of solid acetylene and ethane in NGC 7538:IRS9 derived by Boudin et al. (1998).
Hale-Bopp (this work):
Q(C₂H₂)/Q(CO)	=	0.01 $\pm$ 0.001
Q(C₂H₆)/Q(CO)	=	0.03 $\pm$ 0.004
Q(C₃H₄)/Q(CO)	=	0.008 $\pm$ 0.004
NGC 7538:IRS9 derived by Boudin et al. (1998):
Q(C₂H₂)/Q(CO)	$\le$	0.014
Q(C₂H₆)/Q(CO)	$\le$	0.002

Source LaTeX | All tables | In the text

	1 Introduction
	2 The coma chemistry model
	3 Coma profiles used for the analysis
	4 The chemistry of possible C₂ and C₃ parents
	5 The main chemical reaction network for the formation of C₂ and C₃
	6 Model input: the nucleus - properties and composition
	7 Deriving the production rates
	8 Production rates for C₂H₂, C₂H₆ and C₃H₄
	9 Error discussion
	10 Abundance ratios relative to water and carbon monoxide
	11 Abundance ratios relative to acetylene
	12 Clues on the formation region of comet Hale-Bopp
	13 Summary
	References
	Online Material