APOGEE-2 Discovery of a Large Population of Relatively High-Metallicity
  Globular Cluster Debris
  We report the discovery of a new, chemically distinct population of
relatively high-metallicity ([Fe/H] $> -0.7$) red giant stars with super-solar
[N/Fe] ($\gtrsim +0.75$) identified within the bulge, disk, and halo of the
Milky Way. This sample of stars was observed during the second phase of the
Apache Point Observatory Galactic Evolution Experiment (APOGEE-2); the spectra
of these stars are part of the seventeenth Data Release (DR 17) of the Sloan
Digital Sky Survey. We hypothesize that this newly identified population was
formed in a variety of progenitors, and are likely made up of either fully or
partially destroyed metal-rich globular clusters, which we refer to as Globular
Cluster Debris (GCD), identified by their unusual photospheric nitrogen
abundances. It is likely that some of the GCD stars were probable members of
the Gaia-Enceladus-Sausage accretion event, along with clusters formed in situ.
