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4 papers · 1 filter
Atomic Data and Neutron-Capture Element Abundances in Planetary Nebulae
N. C. Sterling
Neutron(n)-capture elements are produced by s-process nucleosynthesis in low- and intermediate-mass AGB stars, and therefore can be enriched in planetary nebulae (PNe). In the last…
Neutron-Capture Element Abundances in Magellanic Cloud Planetary Nebulae
A. L. Mashburn, N. C. Sterling, S. Madonna +3
We present near-infrared spectra of ten planetary nebulae (PNe) in the Large and Small Magellanic Clouds (LMC and SMC), acquired with the FIRE and GNIRS spectrometers on the 6.5-m…
Connectivity, toughness, spanning trees of bounded degree, and the spectrum of regular graphs
Sebastian M. Cioabă, Xiaofeng Gu
In this paper, we present some new results describing connections between the spectrum of a regular graph and its generalized connectivity, toughness, and the existence of spanning…
Discovery of Rubidium, Cadmium, and Germanium Emission Lines in the Near-Infrared Spectra of Planetary Nebulae
N. C. Sterling, Harriet L. Dinerstein, Kyle F. Kaplan +1
We identify [Rb IV] 1.5973 and [Cd IV] 1.7204 micron emission lines in high-resolution (R=40,000) near-infrared spectra of the planetary nebulae (PNe) NGC 7027 and IC 5117, obtaine…