147 citations · 603 across the 19 of their papers we have counts for
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The chemistry of planetary nebulae in the outer regions of M31
R. L. M. Corradi, K. B. Kwitter, B. Balick +2
We present spectroscopy of nine planetary nebulae (PNe) in the outskirts of M31, all but one obtained with the 10.4m GTC telescope. These sources extend our previous study of the o…
Metal-Rich PNe in the Outer Reaches of M31
Bruce Balick, Karen Kwitter, Romano Corradi +1
Spectroscopic data of two relatively [O III]-luminous-PNe have been obtained with the 10.4-m Gran Telescopio Canarias. M174 and M2496 are each ~1 degree from the center of M31 alon…
Abundances of Disk Planetary Nebulae in M31 and the Radial Oxygen Gradient
K. B. Kwitter, E. M. M. Lehman, B. Balick +1
We have obtained spectra of 16 planetary nebulae in the disk of M31 and determined the abundances of He, N, O, Ne, S and Ar. Here we present the median abundances and compare them…
Reduce, Reuse, Recycle: Planetary Nebulae as Green Galactic Citizens
K. B. Kwitter, R. B. C. Henry
We review gas-phase abundances in PNe and describe their dual utility as archives of original progenitor metallicity via the alpha elements, as well as sources of processed materia…
The curious conundrum regarding sulfur and oxygen abundances in planetary nebulae
R. B. C. Henry, A. Speck, A. I. Karakas +1
We carefully consider numerous explanations for the sulfur abundance anomaly in planetary nebulae. No one rationale appears to be satisfactory, and we suggest that the ultimate exp…
Abundances of Galactic Anticenter Planetary Nebulae and the Oxygen Abundance Gradient in the Galactic Disk
R. B. C. Henry, Karen B. Kwitter, Anne E. Jaskot +3
We have obtained spectrophotometric observations of 41 anticenter planetary nebulae (PNe) located in the disk of the Milky Way. Electron temperatures and densities, as well as chem…