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Title:
The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars
Authors:
Allende Prieto, Carlos; Sivarani, Thirupathi; Beers, Timothy C.; Lee, Young Sun; Koesterke, Lars; Shetrone, Matthew; Sneden, Christopher; Lambert, David L.; Wilhelm, Ronald; Rockosi, Constance M.; Lai, David K.; Yanny, Brian; Ivans, Inese I.; Johnson, Jennifer A.; Aoki, Wako; Bailer-Jones, Coryn A. L.; Re Fiorentin, Paola
Affiliation:
AA(McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712, USA ; Present address: Mullard Space Science Laboratory, University College London, Holmbury St. Mary, Surrey RH5 6NT, UK.; ), AB(Department of Physics & Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AC(Department of Physics & Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AD(Department of Physics & Astronomy, Center for the Study of Cosmic Evolution, and Joint Institute for Nuclear Astrophysics, Michigan State University, East Lansing, MI 48824, USA ), AE(McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712, USA ), AF(McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712, USA ), AG(McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712, USA ), AH(McDonald Observatory and Department of Astronomy, University of Texas, Austin, TX 78712, USA ), AI(Department of Physics, Texas Tech University, Lubbock, TX 79409, USA ), AJ(University of California Observatories/Lick Observatory, 1156 High Street, Santa Cruz, CA 95064, USA ), AK(University of California Observatories/Lick Observatory, 1156 High Street, Santa Cruz, CA 95064, USA ), AL(Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL 60510, USA ), AM(The Observatories of the Carnegie Institution of Washington, Pasadena, CA; and Princeton University Observatory, Princeton, NJ, USA ), AN(Department of Astronomy, Ohio State University, Columbus, OH, USA ), AO(National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan ), AP(Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117, Heidelberg, Germany ), AQ(Max-Planck-Institute for Astronomy, Königstuhl 17, D-69117, Heidelberg, Germany )
Publication:
The Astronomical Journal, Volume 136, Issue 5, pp. 2070-2082 (2008). (AJ Homepage)
Publication Date:
11/2008
Origin:
IOP
AJ Keywords:
methods: data analysis, stars: abundances, stars: fundamental parameters, surveys, techniques: spectroscopic
DOI:
10.1088/0004-6256/136/5/2070
Bibliographic Code:
2008AJ....136.2070A

Abstract

We report high-resolution spectroscopy of 125 field stars previously observed as part of the Sloan Digital Sky Survey and its program for Galactic studies, the Sloan Extension for Galactic Understanding and Exploration (SEGUE). These spectra are used to measure radial velocities and to derive atmospheric parameters, which we compare with those reported by the SEGUE Stellar Parameter Pipeline (SSPP). The SSPP obtains estimates of these quantities based on SDSS ugriz photometry and low-resolution (R ~ 2000) spectroscopy. For F- and G-type stars observed with high signal-to-noise ratios (S/Ns), we empirically determine the typical random uncertainties in the radial velocities, effective temperatures, surface gravities, and metallicities delivered by the SSPP to be 2.4 km s-1, 130 K (2.2 %), 0.21 dex, and 0.11 dex, respectively, with systematic uncertainties of a similar magnitude in the effective temperatures and metallicities. We estimate random errors for lower S/N based on numerical simulations.

Based on observations obtained with the Hobby-Eberly Telescope (a joint project of the University of Texas at Austin, Pennsylvania State University, Stanford University, Ludwig-Maximilians-Universität München, and Georg-August-Universität Göttingen), the W. M. Keck Observatory (operated as a scientific partnership among the California Institute of Technology, the University of California and NASA), and the Subaru Telescope (operated by the National Astronomical Observatory of Japan).


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