A SURVEY OF PROPER MOTION STARS .12. AN EXPANDED SAMPLE

We report new photometry and radial velocities for almost 500 stars fr om the Lowell Proper Motion Catalog. We combine these results with our prior sample and rederive stellar temperatures based on the photometr y, reddening, metallicities (using chi2 matching of our 22 500 low S/N high resolution echelle spectra with a grid of synthetic spectra), di stances, space motions, and Galactic orbital parameters for 1269 (kine matics) and 1261 (metallicity) of the 1464 stars in the complete surve y. The frequency of spectroscopic binaries for the metal-poor ([m/H] l ess-than-or-equal-to -1.2) stars with periods shorter than 3000 days i s at least 15%. The spectroscopic binary frequency for metal-rich star s ([m/H]> -0.5) appears to be lower, about 9%, but this may be a selec tion effect. We also discuss special classes of stars, including treat ment of the double-lined spectroscopic binaries, and identification of subgiants. Four possible new members of the class of field blue strag glers are noted. We point out the detection of three possible new whit e dwarfs, six broad-lined (binary) systems, and discuss briefly the th ree already known nitrogen-rich halo dwarfs. The primary result of thi s paper, Table 6, will be available on CD-ROM, in the form of a much l arger table from which it was drawn.