SEGUE-2: Old Milky Way Stars Near and Far

Rockosi, Constance M.; Sun Lee, Young; Morrison, Heather L.; Yanny, Brian; Johnson, Jennifer A.; Lucatello, Sara; Sobeck, Jennifer; Beers, Timothy C.; Allende Prieto, Carlos; An, Deokkeun; Bizyaev, Dmitry; Blanton, Michael R.; Casagrande, Luca; Eisenstein, Daniel J.; Gould, Andrew; Gunn, James E.; Harding, Paul; Ivans, Inese I.; Jacobson, H. R.; Janesh, William; Knapp, Gillian R.; Kollmeier, Juna A.; Lépine, Sébastien; López-Corredoira, Martín; Ma, Zhibo; Newberg, Heidi J.; Pan, Kaike; Prchlik, Jakub; Sayers, Conor; Schlesinger, Katharine J.; Simmerer, Jennifer; Weinberg, David H.
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The Astrophysical Journal Supplement Series

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The Sloan Extension for Galactic Understanding and Exploration 2 (SEGUE-2) obtained 128,288 low-resolution spectra (R ~ 1800) of 118,958 unique stars in the first year of the Sloan Digital Sky Survey III (2008-2009). SEGUE-2 targeted prioritized distant halo tracers (blue horizontal-branch stars, K giants, and M giants) and metal-poor or kinematically hot populations. The main goal of SEGUE-2 was to target stars in the distant halo and measure their kinematics and chemical abundances to learn about the formation and evolution of the Milky Way. We present the SEGUE-2 field placement and target selection strategies. We discuss the success rate of the targeting based on the SEGUE-2 spectra and other spectroscopic and astrometric surveys. We describe the final SEGUE-2/SDSS-III improvements to the stellar parameter determinations based on the SEGUE Stellar Parameter Pipeline. We report a (g - i) color-effective temperature relation calibrated to the IRFM. We evaluate the accuracy and uncertainties associated with these stellar parameters by comparing with fundamental parameters, a sample of high-resolution spectra of SEGUE stars analyzed homogeneously, stars in well-studied clusters, and stars observed in common by the APOGEE survey. The final SEGUE spectra, calibration data, and derived parameters described here were released in SDSS-III Data Release 9 and continue to be included in all subsequent SDSS Data Releases. Because of its faint limiting magnitude and emphasis on the distant halo, the public SEGUE-2 data remain an important resource for the spectroscopy of stars in the Milky Way.
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