Table 4
N
and CO+ bands from visible spectra.
| λ | Band | L∕Na | Col. densityb | |
|---|---|---|---|---|
| (nm) | (10−20 W) | 22 Dec. | 22 Feb. | |
| 398–403 | CO+ (3– 0) | 0.215 | 1000 ± 102 | 1000 ± 45 |
| 423–426 | CO c |
0.100 | 901 ± 173 | 1721 ± 47 |
| 451–458 | CO+ (4– 2) | 0.145 | 879 ± 44 | 910 ± 33 |
| +CO+ (1– 0) | ||||
| 468–474 | CO+ (2– 1) | 0.085 | 809 ± 61 | 1636 ± 56 |
| 482–488 | CO+ (3– 2) | 0.044 | 296 ± 117 | 1125 ± 106 |
| 502–510 | CO+ (1– 1) | 0.123 | 610 ± 51 | 1610 ± 38 |
| Average CO+ column density: | 768 ± 184 | 1320 ± 377 | ||
| 388–393 | N |
3.56 | 73 ± 7 | 87 ± 16 |
| 426–429 | CO c |
0.115 | 835 ± 179d | 1520 ± 200d |
+N |
1.02 | 77 ± 29e | 50 ± 38e | |
Average N column density: |
73 ± 7 | 83 ± 14 | ||
Col. density ratio N /CO+f: |
0.09 ± 0.03 | 0.06 ± 0.02 | ||
Notes. (a) Values at 1 AU for N
(Lutz et al. 1993), and for CO+ (Magnani and A’Hearn 1986) for (−10, +30 km s−1) heliocentric velocity interval. (b)In relative units, normalized to the first CO+ band: integrated band intensity (in ADU×Å) on the spectrum divided by L∕N. (c) B: CO+ (2–0)Π1∕2 blue wing and R: CO+ (2–0)Π3∕2 red wing. (d) The intensity of the CO+(2–0)Π3∕2 band is derived from this range of column density estimated from the nearby Π1∕2 band and the average of all bands. (e)The intensity of the N
band is inferred from the subtraction of the expected contribution of the CO+ (2–0)Π3∕2. (f) Average column density ratio, including a 20% additional uncertainty to each column density due to the use of approximate values of the L∕N parameter which varies with the heliocentric velocity of the ions (Magnani and A’Hearn 1986).
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