Chromospheric activity on the RS Canum Venaticorum stars
  Firstly, we review the stellar chromospheric activity in the optical wavelength. Secondly, we introduce our ongoing project of multi-wavelength high--resolution optical observations aimed at studying the chromospheric activity of different RS CVn stars. Finally, we give our future perspectives. 
Zhang Liyun, Gu Shenghong
astro-ph.SR