A SHORT SCALE LENGTH FOR THE α-ENHANCED THICK DISK OF THE MILKY WAY: EVIDENCE FROM LOW-LATITUDE SEGUE DATA

We examine the α-element abundance ratio, α/Fe, of 5620 stars, observed by the Sloan Extension for Galactic Understanding and Exploration survey in the region 6kpc<R < 16kpc, 0.15kpc<|Z| < 1.5kpc, as a function of Galactocentric radius R and distance