• DOI:10.3847/1538-4357/ab9a46
• Corpus ID: 210860859

Abundances in the Milky Way across Five Nucleosynthetic Channels from 4 Million LAMOST Stars

@article{Wheeler2020AbundancesIT,
  title={Abundances in the Milky Way across Five Nucleosynthetic Channels from 4 Million LAMOST Stars},
  author={Adam J. Wheeler and Melissa K. Ness and Sven Buder and Joss Bland-Hawthorn and Gayandhi M. De Silva and Michael R. Hayden and Janez Kos and Geraint F. Lewis and Sarah L. Martell and Sanjib Sharma and Jeffrey D. Simpson and Daniel B. Zucker and Toma{\vz} Zwitter},
  journal={The Astrophysical Journal},
  year={2020},
  volume={898}
}

• A. Wheeler, M. Ness, +10 authors T. Zwitter
• Published 22 January 2020
• Physics
• The Astrophysical Journal

Large stellar surveys are revealing the chemodynamical structure of the Galaxy across a vast spatial extent. However, the many millions of low-resolution spectra observed to date are yet to be fully exploited. We employ The Cannon, a data-driven approach for estimating chemical abundances, to obtain detailed abundances from low-resolution (R = 1800) LAMOST spectra, using the GALAH survey as our reference. We deliver five (for dwarfs) or six (for giants) estimated abundances representing five different nucleosynthetic channels, for 3.9 million stars, to a precision of 0.05–0.23 dex. Using wide binary pairs, we demonstrate that our abundance estimates provide chemical discriminating power beyond metallicity alone. We show the coverage of our catalog with radial, azimuthal and dynamical abundance maps and examine the neutron capture abundances across the disk and halo, which indicate different origins for the in situ and accreted halo populations. LAMOST has near-complete Gaia coverage and provides an unprecedented perspective on chemistry across the Milky Way.