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We present the visual orbits of two long period spectroscopic binary stars,HD 8374 and HD 24546, using interferometric observations acquired with theCHARA Array and the Palomar Testbed Interferometer. We also obtained new radialvelocities from echelle spectra using the APO 3.5 m and Fairborn 2.0 mtelescopes. By combining the visual and spectroscopic observations, we solvefor the full, three-dimensional orbits and determine the stellar masses anddistances to within 3% uncertainty. We then estimate the effective temperatureand radius of each component star through Doppler tomography and spectralenergy distribution analyses, in order to compare the observed stellarparameters to the predictions of stellar evolution models. For HD 8374, we findmasses of M1 = 1.636 +/- 0.050 Msun and M2 = 1.587 +/- 0.049 Msun, radii of R1= 1.84 +/- 0.05 Rsun and R2 = 1.66 +/- 0.12 Rsun, temperatures of Teff1 = 7280+/- 110 K and Teff2 = 7280 +/- 120 K, and an estimated age of 1.0 Gyr. For HD24546, we find masses of M1 = 1.434 +/- 0.014 Msun and M2 = 1.409 +/- 0.014Msun, radii of R1 = 1.67 +/- 0.06 Rsun and R2 = 1.60 +/- 0.10 Rsun,temperatures of Teff1 = 6790 +/- 120 K and Teff2 = 6770 +/- 90 K, and anestimated age of 1.4 Gyr. HD 24546 is therefore too old to be a member of theHyades cluster, despite its physical proximity to the group.

Visual Orbits of Spectroscopic Binaries with the CHARA Array. III. HD 8374 and HD 24546