DETERMINATION OF EFFECTIVE TEMPERATURES AND SURFACE GRAVITY OF A NUMBER F-SPECTRAL CLASS STARS BASED ON OBSERVED PHOTOMETRIC INDICES

Abstract

Basic atmospheric parameters — the effective temperatures and surface gravities — were determined for a number of F–type stars: HD 142 (F7V), HD 432 (F2III), HD 493 (F3V), HD 571 (F5II), HD 693 (F8V), HD 905 (F0IV), HD 1324 (F5V), HD 4919 (F3III), and HD 6210 (F6V). The determination of the effective temperature (Teff) and surface gravity (log g) of stars is one of the fundamental tasks of astrophysics. Knowledge of these parameters allows the derivation of evolutionary characteristics such as stellar mass, luminosity, radius, and age. The effective temperatures (Teff) and surface gravities (log g) of the investigated stars were obtained by comparing observational results with theoretically calculated values of the photometric indices [c1], Q, and β. The derived atmospheric parameters agree well with the spectral and luminosity classes of the stars.