EARLY-TYPE STARS IN ORTHOGONAL HALO FIELDS .2. IDENTIFICATION OF METAL-RICH A STARS IN THE HALO

The results of spectrophotometry of the Ca II K and Balmer lines and radial velocity measurements for stars earlier than type F0, with 10 < V < 15.5 in fields at (l;b) = (90-degrees,270-degrees; -45-degrees) are reported. Slit spectroscopy of 320 stars shows that in this magnitude range there are -80 stars with [Fe/H] > -0.5. The metal-rich population has a vertical scale height of approximately 600 pc and a space density at the Sun equal to 1/225 of the young thin disk A star population. The metal-rich A stars have V(rot) = 210+/-60 km/s with decreasing angular momentum as a function of distance from the Galactic plane. The line-of-sight velocity dispersion is 40+/-3 km/s indicating an anomalous relation between structure and kinematics. There is strong evidence that these stars are identical in properties to the metal-rich extended populations found by Perry [AJ, 74, 139 (1969)] at the NGP and Rodgers [AJ, 165, 581 (1971)] at the SGP.