SEGUE: A Spectroscopic Survey of 240,000 stars with g=14-20

Understand

The SEGUE survey obtained 240,000 moderate resolution (R = 1800) spectra from 3900 - 9000 Angstroms of fainter Milky Way stars (14.0 < g < 20.3) of a wide variety of spectral types, both main sequence and evolved objects, with the goal of studying the kinematics and populations of our Galaxy and its halo.

• The spectra are clustered in 212 regions spaced over three-quarters of the sky.
• Radial velocity accuracies for stars are 4 km/s at g < 18, degrading to 15 km/s at g = 20.
• For stars with S/N > 10 per resolution element, stellar atmospheric parameters are estimated, including metallicity, surface gravity, and effective temperature.