The photometric variability of K giants

We have photometrically monitored 49 of the more than 200 K giants in the Yale Catalog of Bright Stars which are named or suspected variable stars. Only two (HR 3275 and HR 5219) are clearly variable; a few more program stars and K- and M-giant comparison stars are marginally variable. Most of these appear to be RS Canum Venaticorum or SR variables.