A very good conversation broke out in our weekly Gaia DR3 & SDSS-V prep meeting today, about Aluminum abundnaces in stellar photospheres, which are the key tool in a new paper about the Milky Way being drafted by Vasily Belokurov (Cambridge). Keith Hawkins (Texas) is in town, and he also happens to be the discoverer of very interesting relationships between Fe, Al, Mg in low-metallicity stars. The ratio [Al/Fe] increases with [Fe/H] at low metallicities and decreases at high metallicities. That has something to do with the different timescales for different kinds of supernovae and different rates of star formation. This all might explain why Christina Eilers (MIT) and I are finding weird issues when we try to fit [Al/Fe] as a function of stellar evolutionary state and dynamical actions in the Galaxy.
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