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Neutron-Capture Element Abundances in Planetary Nebulae

Department of Physics, University of West Georgia, Carrollton, GA 30118, USA
Galaxies 2020, 8(2), 50; https://doi.org/10.3390/galaxies8020050
Received: 17 May 2020 / Revised: 9 June 2020 / Accepted: 12 June 2020 / Published: 17 June 2020
(This article belongs to the Special Issue Workplans II: Workshop for Planetary Nebula Observations)
Nebular spectroscopy is a valuable tool for assessing the production of heavy elements by slow neutron(n)-capture nucleosynthesis (the s-process). Several transitions of n-capture elements have been identified in planetary nebulae (PNe) in the last few years, with the aid of sensitive, high-resolution, near-infrared spectrometers. Combined with optical spectroscopy, the newly discovered near-infrared lines enable more accurate abundance determinations than previously possible, and provide access to elements that had not previously been studied in PNe or their progenitors. Neutron-capture elements have also been detected in PNe in the Sagittarius Dwarf galaxy and in the Magellanic Clouds. In this brief review, I discuss developments in observational studies of s-process enrichments in PNe, with an emphasis on the last five years, and note some open questions and preliminary trends. View Full-Text
Keywords: planetary nebulae, general; nuclear reactions, nucleosynthesis, abundances; stars; AGB and post-AGB; infrared, general planetary nebulae, general; nuclear reactions, nucleosynthesis, abundances; stars; AGB and post-AGB; infrared, general
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Sterling, N.C. Neutron-Capture Element Abundances in Planetary Nebulae. Galaxies 2020, 8, 50.

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