THE FUNDAMENTAL PARAMETERS OF THE STAR HR 6725(F2 III)

Abstract

The atmosphere of HR 6725 (F2 III) giant star of F spectral class was studied using the model and parallax methods. The effective temperature (Tef f ) and surface of gravity g on the surface of the star were determined based on a comparison of the observed and theoretically calculated values of the photometric quantities [c1], Q, and the equivalent widths of the spectral lines
of the hydrogen Balmer series and the using of parallax. Based on the FeII lines the microturbulence (ξt) and the metallicity [Fe/H] were determined. In the atmosphere of the star, the metallicity is close to the metallicity of the Sun. This shows that the star we are studying and the Sun are formed from the same metallicity matter