Target Selection for the SDSS-IV APOGEE-2 Survey

November 2017 • 2017AJ....154..198Z

Authors • Zasowski, G. • Cohen, R. E. • Chojnowski, S. D. • Santana, F. • Oelkers, R. J. • Andrews, B. • Beaton, R. L. • Bender, C. • Bird, J. C. • Bovy, J. • Carlberg, J. K. • Covey, K. • Cunha, K. • Dell'Agli, F. • Fleming, Scott W. • Frinchaboy, P. M. • García-Hernández, D. A. • Harding, P. • Holtzman, J. • Johnson, J. A. • Kollmeier, J. A. • Majewski, S. R. • Mészáros, Sz. • Munn, J. • Muñoz, R. R. • Ness, M. K. • Nidever, D. L. • Poleski, R. • Román-Zúñiga, C. • Shetrone, M. • Simon, J. D. • Smith, V. V. • Sobeck, J. S. • Stringfellow, G. S. • Szigetiáros, L. • Tayar, J. • Troup, N.

Abstract • APOGEE-2 is a high-resolution, near-infrared spectroscopic survey observing ∼3 × 10⁵ stars across the entire sky. It is the successor to APOGEE and is part of the Sloan Digital Sky Survey IV (SDSS-IV). APOGEE-2 is expanding on APOGEE's goals of addressing critical questions of stellar astrophysics, stellar populations, and Galactic chemodynamical evolution using (1) an enhanced set of target types and (2) a second spectrograph at Las Campanas Observatory in Chile. APOGEE-2 is targeting red giant branch and red clump stars, RR Lyrae, low-mass dwarf stars, young stellar objects, and numerous other Milky Way and Local Group sources across the entire sky from both hemispheres. In this paper, we describe the APOGEE-2 observational design, target selection catalogs and algorithms, and the targeting-related documentation included in the SDSS data releases.

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Jennifer Sobeck

Associate Scientist