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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



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ID: 421772.0, MPI für Astronomie / Publikationen_mpia
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
Language:English
Date of Publication (YYYY-MM-DD):2008
Title of Journal:The Astronomical Journal
Journal Abbrev.:The Astronomical Journal
Volume:136
Start Page:2070
End Page:2082
Review Status:not specified
Audience:Experts Only
Abstract / Description: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).
Free Keywords:methods: data analysis; stars: abundances; stars: fundamental parameters; surveys; techniques: spectroscopic
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:URL:http://adsabs.harvard.edu/abs/2008AJ....136.2070A [ID No:1]
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