SEGUE恒星参数管道。III。与SDSS/SEGUE场星高分辨光谱的比较
The SEGUE Stellar Parameter Pipeline. III. Comparison with High-Resolution Spectroscopy of SDSS/SEGUE Field Stars
摘要：
我们报告了125颗场星的高分辨率光谱，这些场星是斯隆数字巡天计划及其银河系研究计划的一部分，即斯隆银河系理解和探索扩展计划（SEGUE）。这些光谱被用来测量径向速度，并推导出大气参数，我们比较与那些报告的SEGUE恒星参数管道（SSPP）。SSPP根据SDSS ugriz光度法和低分辨率（R = 2000）光谱法获得这些数量的估计值。对于具有高信噪比（S/N）的F-和G-型恒星，我们经验地确定由SSPP提供的径向速度、有效温度、表面重力和金属丰度的典型随机不确定性为2.4 km/s，130 K（2.2%），0.21德克斯，和0.11德克斯，分别与系统的不确定性类似的幅度在有效温度和金属丰度。我们估计的随机误差较低的S/N谱的数值模拟的基础上。
英文摘要：
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.
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