Astronomy and Astrophysics – Astrophysics
Scientific paper
2007-10-31
Astron.J.136:2070-2082,2008
Astronomy and Astrophysics
Astrophysics
37 pages, 6 tables, 6 figures, submitted to the Astronomical Journal
Scientific paper
10.1088/0004-6256/136/5/2070
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/N), 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, 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 spectra based on numerical simulations.
Allende Prieto Carlos
Aoki Wako
Bailer-Jones Coryn A. L.
Beers Timothy C.
Ivans Inese I.
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