I presented my ideas about self-calibration at the SDSS-IV & SDSS-V meeting today. In my talk, Bovy (Toronto) pointed out that there is no way to distinguish stellar-evolutionary effects from surface-gravity-related measurement biases. Good point! But then in the discussion afterwards, Ness (Columbia) pointed out that the causal arguments I am employing can be used to infer true birth abundances or the abundances the star had long ago at its formation. That's potentially incredibly valuable for projects like chemical tagging and related. That's a great insight.
There were many thought-provoking talks today about developing stellar spectral libraries and improving stellar-parameter and abundance inferences, including by Chen (NYUAD), Hill (Portsmouth), Lazarz (Kentucky), Xiang (MPIA), Imig (NMSU), and Wheeler (Columbia). Many of these were driven by the the MaSTAR project to use the BOSS spectrographs to perform stellar populations inferences in nearby galaxies. It's great that the galaxy-evolution and stellar spectroscopy worlds are colliding in the SDSS-IV project. I can't help mentioning that Imig did a great job of summarizing (and using) The Cannon in this context.
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