Study of dwarfs and giants in the Hyades cluster

Results are reported of a study of the atmospheric chemical composition for 12 F5-K0 type stars in the Hyades cluster. The study uses spectra obtained with the 1.93-m telescope of the Haute-Provence Observatory (France) with the ELODIE echelle-type spectrograph in the wavelength range 440–680 nm. The spectral resolution is R = 40000, and S/N is ～50. The equivalent widths of the lines are measured in the wavelength range 510–680 nm. The main parameters of the stars are determined: the effective temperature T _eff, the gravity logg, the microturbulence velocities V _t , and the abundances of Na, Mg, Al, Si, Ca, Ti, V, Cr, Fe, Co, Ni, Y, La, Ce, and Nd. The abundance estimates for the dwarfs and giants are similar within the errors of determination, except for the Na abundances.