I had a nice conversation today with Renbin Yan (Kentucky) and Xihan Ji (Kentucky) about work they have been doing with emission-line ratios. Typically these ratios are plotted on a “BPT” diagram (yes, named after people, unfortunately). Ji has been looking for more informative two-dimensional diagrams, by considering linear combinations of a larger set of ratios. He has beautiful visualizations! And he can also clearly show how the models of the line ratios depend on assumptions and parameters, which develop intuitions about what the ratios tell us, physically. We briefly discussed the possibility that we might actually be able to constrain nucleosynthesis parameters using emission-line spectra of nebulae!
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