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Table 1.
Fitted parameters for the radial gradients of the log (O/Ar) values for HII regions (literature values) and in the M31 disc from the Paper IV M31 disc PNe sample.
| Sample | log(O/Ar)0 | Δlog(O/Ar)/ΔR |
|
|---|---|---|---|
| dex kpc−1 | dex/rd | ||
| HII regions | 2.51 ± 0.13 | −0.013 ± 0.008 | −0.078 ± 0.049 |
| High-extinction PNe (all) | 2.14 ± 0.04 | 0.004 ± 0.003 | 0.024 ± 0.021 |
| RGC ≤ 14 kpc | 2.28 ± 0.05 | −0.011 ± 0.005 | −0.072 ± 0.032 |
| RGC > 18 kpc | 2.62 ± 0.28 | −0.013 ± 0.012 | −0.08 ± 0.075 |
| Low-extinction PNe | 2.1 ± 0.05 | 0.01 ± 0.003 | 0.063 ± 0.016 |
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