1. Eclipse observations of active binary systems. Gunn A.G., Doyle J.G. & Houdebine E.R., in Cool Stars, Stellar Systems, and the Sun, J-P. Caillault (ed), Proceedings of the 8th Cambridge Workshop, ASP Conference Series Volume 64, p702. Compressed Postscript (24 kbytes) Compressed PDF (105 kbytes) ABSTRACT. We present and discuss some new data obtained in our study of the atmospheres and environments of active binary systems (RS CVns). High spectral and time resolution observations of the spectral lines Ca II H & K and Halpha have been obtained for several systems.