  We investigate if the super-saturation phenomenon observed at X-ray
wavelengths for the corona, exists in the chromosphere for rapidly rotating
late-type stars. Moderate resolution optical spectra of fast rotating EUV- and
X-ray- selected late-type stars were obtained. Stars in alpha Per were observed
in the northern hemisphere with the Isaac Newton 2.5 m telescope and IDS
spectrograph. Selected objects from IC 2391 and IC 2602 were observe in the
southern hemisphere with the Blanco 4m telescope and R-C spectrograph at CTIO.
Ca II H & K fluxes were measured for all stars in our sample. We find the
saturation level for Ca II K at log(L_CaK/L_bol) = -4.08. The Ca II K flux does
not show a decrease as a function of increased rotational velocity or smaller
Rossby number as observed in the X-ray. This lack of "super-saturation"
supports the idea of coronal-stripping as the cause of saturation and
super-saturation in stellar chromospheres and corona, but the detailed
underlying mechanism is still under investigation.
