A CATALOG OF CHROMOSPHERICALLY ACTIVE BINARY STARS (2ND EDITION)

The catalog contains 206 spectroscopic binary systems with at least on e late-type component that shows Ca II H and K emission in its spectru m. These systems include the classical RS CVn binaries and BY Dra bina ries. The catalog summarizes information on the photometric, spectrosc opic, orbital, and physical properties of the systems as well as space motions and positions. Up to 42 ''parameters'' for each stellar syste m are listed followed by the appropriate reference to direct intereste d colleagues to the original papers. A comprehensive selection of furt her information for each star is given in the individual notes. In add ition, the catalog contains a candidate list of 138 stars that have si milar characteristics but are not definitely known binaries or have no t had Ca II H and K emission observed.