Below I illustrate typical line profile variation produced by different types of structures on the surfaces of rotating stars. I am doing Doppler Imaging analysis of all these different types of starspots.
|Temperature||Chemical abundance||Magnetic field||Non-radial pulsation|
|Non-radial pulsations The surface shape of pulsating stars is periodically distorted in a complex way. The main effect on the spectral line profiles is their differential Doppler shift due to variation of the local velocity with respect to distant observer. The corresponding perturbations in the spectral lines can propagate both from blue to red or from red to blue. This variability strongly depends on the l and m numbers of the dominant pulsation mode excited in the star.|