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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 = −0.02±0.01 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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