  We present the visual orbits of four spectroscopic binary stars, HD 61859, HD
89822, HD 109510, and HD 191692, using long baseline interferometry with the
CHARA Array. We also obtained new radial velocities from echelle spectra using
the APO 3.5 m, CTIO 1.5 m, and Fairborn Observatory 2.0 m telescopes. By
combining the astrometric and spectroscopic observations, we solve for the
full, three-dimensional orbits and determine the stellar masses to 1-12%
uncertainty and distances to 0.4-6% uncertainty. We then estimate the effective
temperature and radius of each component star through Doppler tomography and
spectral energy distribution analyses. We found masses of 1.4-3.5 Msun, radii
of 1.5-4.7 Rsun, and temperatures of 6400-10300K. We then compare the observed
stellar parameters to the predictions of the stellar evolution models, but
found that only one of our systems fits well with the evolutionary models.
