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We have used the Goddard High Resolution Spectrograph (GHRS) on the Hubble Space Telescope (HST) to measure the macroturbulent and flow velocities, the acceleration of winds, and the amount of hot (transition-region) plasma in the outer atmospheres of Carbon and Κ Μ Giant/Supergiant stars. We see the acceleration of the stellar winds in the chromospheres of several of these stars from initial velocities of 3 9 km/s to upper velocities of 15 25 km/s and measured chromospheric macroturbulences ranging from approximately 25 to 35 km/s. We have found in the in the non-coronal giant a. Tau weak C IV emission indicative of hot transitionregion plasma, many new fluorescent lines of Fe Π, and fluorescent molecular hydrogen emission and Ca Π recombination lines seen for the first time in a giant star.

The Outer Atmospheres of Cool, Low Gravity Stars as Revealed by HST