The survey of planetary nebulae in Andromeda (M 31) V. Chemical enrichment of the thin and thicker discs of Andromeda. Oxygen to argon abundance ratios for planetary nebulae and H II regions
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Author
Arnaboldi, Magda
Bhattacharya, Souradeep
Gerhard, Ortwin
Kobayashi, Chiaki
Freeman, Kenneth C.
Caldwell, Nelson
Hartke, Johanna
McConnachie, Alan
Guhathakurta, Puragra
Attention
2299/25832
Abstract
We use oxygen and argon abundances for planetary nebulae (PNe) with low internal extinction (progenitor ages of (>4.5 Gyr) and high extinction (progenitor ages