The Spectrum Analysis of Three Chromospherically Active Binary Stars

We present the research results on new CCD spectroscopic observations of three chromospherically active binary stars (BY Dra class), which were obtained by means of Coude echelle spectrograph fed by the 2.16m telescope at Beijing Ast ronomical Observatory.These spectrum images were reduced according to the standard fashion using IRAF package.With the aid of stellar model atmosphere, we have analy zed these spectra and derived the average metal abundance and Li abundance of three systems.Using two special spectral lines, we have also discussed the chromospheric activity indicato rs of them.