SEGUE-2: Old Milky Way Stars Near and Far
Date Issued
2022
Author(s)
Rockosi, Constance M.
•
Lee, Young Sun
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Morrison, Heather L.
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Yanny, Brian
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Johnson, Jennifer A.
•
•
Sobeck, Jennifer
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Beers, Timothy C.
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Allende Prieto, Carlos
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An, Deokkeun
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Bizyaev, Dmitry
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Blanton, Michael R.
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Casagrande, Luca
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Eisenstein, Daniel J.
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Gould, Andrew
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Gunn, James E.
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Harding, Paul
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Ivans, Inese I.
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Jacobson, H. R.
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Janesh, William
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Knapp, Gillian R.
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Kollmeier, Juna A.
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Lépine, Sébastien
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López-Corredoira, Martín
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Ma, Zhibo
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Newberg, Heidi J.
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Pan, Kaike
•
Prchlik, Jakub
•
Sayers, Conor
•
Schlesinger, Katharine J.
•
Simmerer, Jennifer
•
Weinberg, David H.
Abstract
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.
Volume
259
Issue
2
Start page
60
Issn Identifier
0067-0049
Ads BibCode
2022ApJS..259...60R
Rights
open.access
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