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Table 3

Calculated percentage contributions for major production processes of green and red-doublet emissions in the slit projected field of view on different comets, and the comparison of the calculated and observed line widths.

Comet hν + H2O hν + CO2 hν + CO O(1S) O(1D) e + H2O+ e + CO 5577 Line width 6300 Line width

Cal*** Obs** Cal*** Obs**

116P/Wild 4 34 (72)* 26 (2) 7 (0.5) (9) 14 (13) 14 (1) 1.70 1.32
C/2003 K4 (LINEAR) 40 (81) 31 (3) 10 (1) (8) 6 (5) 7 (0.5) 2.05 2.38–2.76 1.87 1.81–2.12
C/2007 Q3 (Siding Spring) 28 (72) 37 (4) 3 (0.5) (10) 9 (10) 15 (1) 2.04 1.44
C/2006 W3 (Christensen) 14 (61) 47 (8) 14 (3) (16) 3 (6) 15 (3) 2.48 1.58
C/2009 P1 (Garradd) 16 (55) 31 (4) 17 (3) (13) 10 (15) 21 (3) 1.85 2.16–2.54 1.25 1.25–1.67
C/2001 Q4 (NEAT) 8 (44) 47(11) 8 (2) (22) 4 (9) 26 (6) 2.30 2.31–2.55 1.65 2.39–2.75
Comet X**** 6 (36) 46(11) 6 (1) (25) 4 (10) 31 (8) 2.35 1.65

Notes.

(*)

The values in parentheses are calculated percentage contributions for red-doublet emission;

(**)

Obs: observed line widths are taken from Decock et al. (2013);

(***)

Cal: model calculated line widths;

(****)

comet X is a hypothetical comet similar to the observational condition of comet NEAT and having equal gas production rates of H2O, CO2, and CO; hν = photon; e = thermal electron.

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