Table 3
Medians of the logarithms of the 12P abundance ratios compared to the taxonomic groups found by A’Hearn et al. (1995).
| 12P | Typical | Depleted | |
|---|---|---|---|
| This work | A’Hearn et al. (1995) | ||
| OH/CN | 2.48 ± 0.17 | 2.50 ± 0.18 | 2.69 ± 0.14 |
| NH/CN | 0.15 ± 0.34 | 0.13 ± 0.32 | 0.21 ± 0.37 |
| C2/CN | 0.07 ± 0.16 | 0.06 ± 0.10 | −0.61 ± 0.35 |
| C3/CN | −0.73 ± 0.15 | −1.09 ± 0.34 | −1.49 ± 0.31 |
| A(0)fρ/CN | −22.40 ± 0.18 | − | − |
| A(θ)fρ/CN | −22.74 ± 0.18 | −23.32 ± 0.44 | −22.61 ± 0.32 |
Notes. Uncertainties are given as the standard deviation. A(0)fρ was calculated from the images taken with the Rc filter, outside of outbursts. A(θ)fρ is also given to compare to the A’Hearn et al. (1995) study that did not take into account any phase angle effect in their calculations. We note that the difference in C3/CN is due to the use of an updated dust continuum removal factor for the C3 filter (Schleicher & Osip 2002), increasing of the C3 flux 2.08 times (a difference of 0.32 in the logarithm scale) compared to the previous factor used in A’Hearn et al. (1995).
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