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Target Selection for the SDSS-IV APOGEE-2 Survey

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arxiv 1708.00155 v2 pith:RJEJRDWX submitted 2017-08-01 astro-ph.GA astro-ph.SR

G. Zasowski , R. E. Cohen , S. D. Chojnowski , F. Santana , R. J. Oelkers , B. Andrews , R. L. Beaton , C. Bender
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J. C. Bird J. Bovy J. K. Carlberg K. Covey K. Cunha F. Dell'Agli S. W. Fleming P. M. Frinchaboy D. A. Garcia-Hernandez P. Harding J. Holtzman J. A. Johnson J. A. Kollmeier S. R. Majewski Sz. Meszaros J. Munn R. R. Munoz M. K. Ness D. L. Nidever R. Poleski C. Roman Zuniga M. Shetrone J. D. Simon V. V. Smith J. S. Sobeck G. S. Stringfellow L. Szigetiaros J. Tayar N. Troup
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classification astro-ph.GAastro-ph.SR
keywords apogee-2starsstellarsurveytargetacrossapogeeentire
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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.

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    Gaia-derived parameters for 13 Orion clusters fed into N-body simulations reveal two regimes: seven with α_vir ≲ 7 retain bound cores for ≳170 Myr while six with α_vir ≳ 7 dissolve before 120 Myr.

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