A spectroscopic analysis of three supergiants

A spectroscopic analysis based on high S/N, high dispersion spectra, is presented for four stars suspected to be G or K supergiants lying out of the galactic plane, or having peculiar high velocities. This analysis shows that three of them (HD 45829, HD 63700 and HD 68752) are likely to be normal supergiants (-6 < Mv < - 3), though closer to us than formerly considered; the remaining star (HD 75289) is a metal-rich dwarf, erroneously classified as a supergiant. All stars show variable radial velocities; they are likely to be spectroscopic binaries. A preliminary orbit is obtained for HD 63700. (author)