Click here to download the APOGEE-Kepler catalog, KITP version, including some starter code in idl and python

[Fe/H] and [alpha/Fe] from APOGEE DR14 versus APOKASC (Pinsonneault et al. 2018) age. There is still some bias towards measuring younger than reality ages in this sample (especially for metal-poor and alpha-rich stars), but not as much as Epstein et al. 2014. In each plot the colors of the boxes indicate the density of points in that region (darker=more dense), and the number of stars included in the plot is indicated in the upper right corner.

Individual element abudances versus APOKASC age. Note that in some cases (e.g. carbon and nitrogen) the trend is imposed by stellar evolution and mixing rather than chemical evolution of the galaxy. Additionally, these plots sample a very limited part of the galaxy, so it is not clear that any correlations that hold here would hold when looking in another direction (i.e. at a different galactocentric height with a different ratio of alpha-rich and alpha-poor stars).

Sometimes combinations of elements do better than either element alone, but not always

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