2005A&A...440..295L

We present results on our long-term velocity monitoring of the C-rich semi-regular variable WZCas with a Coravel instrument. Our findings are compared with light changes of the star. We suggest that the two main periods, 366 and 186d, are due to radial pulsation. Furthermore, we find an interesting variation of the width and depth of the cross-correlation profile over a time-scale of at least 1000d. Several possible explanations for this behaviour are discussed by comparison of time-scales and expected variability amplitudes. The influence of movements of large convective cells on the line profiles seems to be the most likely explanation of some of the observed phenomena.