68 citations · 299 across the 9 of their papers we have counts for
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Sulfur, Chlorine, and Argon Abundances in Planetary Nebulae. III: Observations and Results for a Final Sample
K. B. Kwitter, R. B. C. Henry, J. B. Milingo
This paper is the fourth in a series whose purpose is to study the interstellar abundances of sulfur, chlorine, and argon in the Galaxy using a sample of 86 planetary nebulae. Here…
Sulfur, Chlorine, and Argon in Planetary Nebulae. IIA: Observations of a Southern Sample
J. B. Milingo, K. B. Kwitter, R. B. C. Henry +1
In this paper we present fully reduced and dereddened emission line strengths for a sample of 45 southern Type II planetary nebulae (PNe). The spectrophotometry for these PNe cover…
Sulfur, Chlorine, & Argon Abundances in Planetary Nebulae. IIB: Abundances in a Southern Sample
J. B. Milingo, R. B. C. Henry, K. B. Kwitter
We have undertaken a large spectroscopic survey of over 80 planetary nebulae with the goal of providing a homogeneous spectroscopic database between 3600-9600 Angstroms, as well as…
A New Look At Carbon Abundances In Planetary Nebulae. IV. Implications For Stellar Nucleosynthesis
R. B. C. Henry, K. B. Kwitter, J. A. Bates
This paper is the fourth and final report on a project designed to study carbon abundances in a sample of planetary nebulae representing a broad range in progenitor mass and metall…
Morphology and Composition of the Helix Nebula
R. B. C. Henry, K. B. Kwitter, R. J Dufour
We present new narrow-band filter imagery in H-alpha and [N II] 6584 along with UV and optical spectrophotometry measurements from 1200 to 9600 Angstroms of NGC 7293, the Helix Neb…