  We have obtained high-resolution echelle spectra of 18 solar-type stars that
an earlier survey showed to have very high levels of Ca II H and K emission.
Most of these stars belong to close binary systems, but 5 remain as probable
single stars or well-separated binaries that are younger than the Pleiades on
the basis of their lithium abundances and H-alpha emission. Three of these
probable single stars also lie more than 1 magnitude above the main sequence in
a color-magnitude diagram, and appear to have ages of 10 to 15 Myr. Two of
them, HD 202917 and HD 222259, also appear to have a kinematical association
with the pre-main sequence multiple system HD 98800.
