Abstract
We report the results of abundance determinations for the components of the SB2 star HD 153720 from high resolution (R = 60 000) echelle high signal-to-noise spectra of the wavelength region 3595-10 260 A taken with the 2.7 m telescope of the McDonald Observatory We found the values of the atmospheric parameters of the primary to be effective temperature T eff = 7425 K and surface gravity log g = 4.0 cgs, and of the secondary to be T eff = 7125 K and log g = 3.9 cgs. The microturbulent velocity is υ micro = 2.7 km s -1 for both components, and the projected rotational velocity is υ sin i = 15 km s -1 also for both components. The abundances of about 20 elements were determined with the method of spectrum synthesis. The components of HD 153720 are metallic-line stars. Possible inconsistencies between old and new measurements of radial velocities may be explained by the existence of third body in this system. A review of recent high resolution spectral observations of eight A4-F1 binaries shows that only one of these systems can be classified as normal.
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