Chromospheric activity and orbital solution of six new late-type spectroscopic binary systems

We present here the results of our high resolution echelle spectroscopic observations of six recently identified spectroscopic binary systems with late-type stellar components (HD 82159 (BD + 11 2052 A); HIP 63322 (BD + 39 2587); HD 160934 (RE J1738 + 611); HD 89959 (BD + 41 2078); HD 143705 (BD + 29 2752); HD 138157 (OX Ser)). The orbital solution has been obtained using precise radial velocities determined by cross-correlation with radial velocity standard stars as well as previous values reported by other authors. These multiwavelength optical observations allow us to study the chromosphere of these active binary systems using the information provided by several optical spectroscopic features (from Ca II H & K to Ca II IRT lines) that are formed at different heights in the chromosphere. The chromospheric contribution in these lines has been determined using the spectral subtraction technique. In addition, we have determined rotational velocities (vsin i), lithium (Li I lambda 6707.8 angstrom) abundance, and kinematic properties (membership in representative young disk stellar kinematic groups).