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.
@article{arxiv.0710.5780,
title = {The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars},
author = {C. Allende Prieto and T. Sivarani and T. C. Beers and Y. S. Lee and L. Koesterke and M. Shetrone and C. Sneden and D. L. Lambert and R. Wilhelm and C. M. Rockosi and D. Lai and B. Yanny and I. I. Ivans and J. A. Johnson and W. Aoki and C. A. L. Bailer-Jones and P. Re Fiorentin},
journal= {arXiv preprint arXiv:0710.5780},
year = {2008}
}
Comments
37 pages, 6 tables, 6 figures, submitted to the Astronomical Journal