Vedant Chandra, Phillip A. Cargile, Alexander P. Ji, Charlie Conroy, Hans-Walter Rix, Emily C. Cunningham, B. Dias, Chervin F. P. Laporte, W. Cerny, Guilherme Limberg, Avrajit Bandyopadhyay, Ana Bonaca, Andrew R. Casey, John Donor, José G. Fernández-Trincado, Peter M. Frinchaboy, Pramod Gupta, Keith Hawkins, Jennifer A. Johnson, Juna A. Kollmeier, Madeline Lucey, Ilija Medan, Szabolcs Mészáros, Sean Morrison, José Sánchez-Gallego, Andrew K. Saydjari, Conor Sayres, Kevin C. Schlaufman, Keivan G. Stassun, Jamie Tayar, Z. Way
Abstract The fifth-generation Sloan Digital Sky Survey (SDSS-V) is conducting the first all-sky low-resolution spectroscopic survey of the Milky Way’s (MW) stellar halo. We describe the stellar parameter pipeline for the SDSS-V halo survey, which simultaneously models spectra, broadband photometry, and parallaxes to derive stellar parameters, metallicities, alpha abundances, and distances. The resulting Baryon Oscillation Spectroscopic Survey (BOSS)- MINESweeper catalog is validated across a wide range of stellar parameters and metallicities using star clusters and a comparison to high-resolution spectroscopic surveys. We demonstrate several scientific capabilities of this dataset: identifying the most chemically peculiar stars in our Galaxy, discovering and mapping distant halo substructures, and measuring the all-sky dynamics of the MW on the largest scales. The BOSS- MINESweeper catalog for SDSS DR19 is publicly available and will be updated for future data releases.