“…Using the same 2.5m telescope at Apache Point Observatory as that employed for previous SDSS projects (Gunn et al 2006), APOGEE is a Galactic survey designed to obtain infrared stellar spectra in the H-band (1.5-1.7 µm) with a resolving power of R ∼ 22, 500. From such spectra, stellar atmospheric parameters and chemical abundances of 15 elements (C, N, O, Na, Mg, Al, Si, S, K, Ca, Ti, V, Mn, Fe, Ni) were determined with the ASPCAP pipeline (García Pérez et al 2016;Holtzman et al 2015). APOGEE was designed to explore the principal stellar components of the Galaxy, mainly the Galactic disk and bulge, but it also observed stars that are members of the Galactic halo.…”