The survey of planetary nebulae in Andromeda (M31) - V. Chemical enrichment of the thin and thicker discs of Andromeda: Oxygen to argon abundance ratios for planetary nebulae and HII regions

Open Access

Fig. B.1.

Chemical evolution model in the 2 ≤ R_GC ≤ 14 disc region. (a) Star formation history, compared to the observational results from Williams et al. (2017). (b) Evolution of iron (red and blue lines) and argon (light red and blue lines) abundances in the ISM. (c) Metallicity distribution function, compared to the observational results from Williams et al. (2017). (d) O/Ar–Ar/H relation, compared to our PN sample; magenta for low-extinction PNe over the entire M31 disc (R_GC = 2–30 kpc) and cyan for high-extinction PNe at R_GC < 14 kpc (same as in Fig. 7).

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