![]() Substantial separation in birth ratios between high. Trends in the MaNGA integral field survey of nearby galaxies. The stellar N/O trend agrees well with DopitaĮt al.’s calibration of gas phase log(N/O) with metallicity, and with gas phase Applying mixing corrections to theĪPOGEE abundances removes the observed age-dependence of log(N/O) and log(C/N),īut it leaves trends of log(N/O) and log(C/N) with metallicity, as expectedīased on nucleosynthesis models. “extra” mixing processes fail, predicting trends with surface gravity orĮvolutionary state that are not observed. To within plausible uncertainties in the birth abundances. ![]() Our models with standard mixing can reproduce the observed trends Mixing, then apply these models to derive birth C, N, and O abundances for Masses from Kepler, we test theoretical stellar models that predict this ∼ 5100 stars with elemental abundances from APOGEE and asteroseismic Material mixed into the stars’ convective envelopes. Surface abundances of C, N, and O in red giants are affected by processed
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