Excitation mechanisms of C II optical permitted lines in ionized nebulae
Context. Carbon is the fourth most abundant element in the universe and its distribution is critical to understanding stellar evolution and nucleosynthesis. In optical studies of ionized nebulae, the only way to determine the C/H abundance is by using faint C II recombination lines (RLs). However, these lines give systematically higher abundances
Reyes-Rodríguez, E. et al.
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2024