We interpret this result as indicating that even without dramatic flaring the high temperature plasmas are significantly variable. Active Stars Ramsey has been studying the peculiar rapidly rotating giant FK Com. In a series of 51 FOE spectra from 1989 they discovered a periodic variation of linewidth, which they interpreted as evidence for non-radial pulsations. Other less extensive FOE datasets reveal different patterns of linewidth variation. In 1994 May they obtained 403 FOE spectra to study this phenomenon in greater detail.
Analysis is ongoing.
Dozens of journal articles and several Ph.D. theses based on those data have not exhausted the potential of those data. Interacting Binary Stars Wade and collaborators carried out a study of the ultraviolet spectra of accretion disks in cataclysmic variables, with emphasis on limb darkening. As with stars, disk limb darkening is especially important in the UV, and at a given wavelength is more important for low temperature atmospheres. UV surface brightness distributions show the expected temperature and wavelength dependences. In the latter case, there are noticeable changes in the shapes of lines from highly ionized species and in the ratio of lines formed at high and low temperature, so high quality line profiles obtained in the UV may serve as a diagnostic of the structure of the disk.