Residual Abundances in GALAH DR3: Implications for Nucleosynthesis and Identification of Unique Stellar Populations

  title={Residual Abundances in GALAH DR3: Implications for Nucleosynthesis and Identification of Unique Stellar Populations},
  author={Emily J. Griffith and David H. Weinberg and Sven Buder and Jennifer A. Johnson and James W. Johnson and Fiorenzo Vincenzo},
  journal={The Astrophysical Journal},
We investigate the [X/Mg] abundances of 16 elements for 82,910 Galactic disk stars from GALAH+ DR3. We fit the median trends of low-Ia and high-Ia populations with a two-process model, which describes stellar abundances in terms of a prompt core-collapse and delayed Type-Ia supernova component. For each sample star, we fit the amplitudes of these two components and compute the residual Δ[X/H] abundances from this two-parameter fit. We find rms residuals ≲0.07 dex for well-measured elements and… 

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