HD 153720 - A SB2 system with twin metallic-line components

Details HD 153720 - A SB2 system with twin metallic-line components HD 153720 - A SB2 system with twin metallic-line components

Oct 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...425..171y&link_type=abstract

Astronomy and Astrophysics, v.425, p.171-177 (2004)

Astronomy and Astrophysics

Astrophysics

7

Stars: Abundances, Stars: Atmospheres, Stars: Evolution, Stars: Chemically Peculiar, Stars: Binaries: Spectroscopic, Stars: Individual: Hd 153720

Scientific paper

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 Å 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 Teff = 7425 K and surface gravity log g,= 4.0 cgs, and of the secondary to be Teff = 7125 K and log g,= 3.9 cgs. The microturbulent velocity is vmicro= 2.7 km s-1 for both components, and the projected rotational velocity is v 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.
Based on observations obtained at the 2.7-m telescope of the McDonald Observatory.
The data are only available in electronic form at http://www.edpsciences.org

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