APOGEE-2 is a high-resolution, near-infrared spectroscopic survey observing roughly 300,000 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 upon 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 (RGB) and red clump (RC) 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.
@article{arxiv.1708.00155,
title = {Target Selection for the SDSS-IV APOGEE-2 Survey},
author = {G. Zasowski and R. E. Cohen and S. D. Chojnowski and F. Santana and R. J. Oelkers and B. Andrews and R. L. Beaton and C. Bender and J. C. Bird and J. Bovy and J. K. Carlberg and K. Covey and K. Cunha and F. Dell'Agli and S. W. Fleming and P. M. Frinchaboy and D. A. Garcia-Hernandez and P. Harding and J. Holtzman and J. A. Johnson and J. A. Kollmeier and S. R. Majewski and Sz. Meszaros and J. Munn and R. R. Munoz and M. K. Ness and D. L. Nidever and R. Poleski and C. Roman Zuniga and M. Shetrone and J. D. Simon and V. V. Smith and J. S. Sobeck and G. S. Stringfellow and L. Szigetiaros and J. Tayar and N. Troup},
journal= {arXiv preprint arXiv:1708.00155},
year = {2017}
}