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Paper: Discrepant Gradients in Oxygen from Planetary Nebulae and HII Regions Across the Galactic Disk: Can Radial Flows of Gas Reconcile Them?
Volume: 374, From Stars to Galaxies: Building the Pieces to Build Up the Universe
Page: 141
Authors: Chiosi, C.; Perinotto, M.
Abstract: Recent critical revision of the oxygen abundances in Planetary Nebulae (PNe) by Perinotto, Morbidelli & Scatarzi (2004) yields the gradient in oxygen Δ[O/H]/ΔR = −0.020.01 dex/kpc (Perinotto & Morbidelli, 2006), much flatter than older estimates Δ[O/H]/ΔR = −0.07 dex/ kpc and also flatter than current estimates from HII regions -0.04 to -0.07 (Deharveng et al. 2000, Caplan et al. 2000).
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