WZ Cas - Variability on multiple time-scales
- Author(s)
- Thomas Lebzelter, R F Griffin, Kenneth H. Hinkle
- Abstract
We present results on our long-term velocity monitoring of the C-rich semi-regular variable WZ Cas with a Coravel instrument. Our findings are compared with light changes of the star. We suggest that the two main periods, 366 and 186 d, 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 1000 d. 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. ΠESO 2005.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- University of Cambridge, National Optical Astronomy Observatory, Tucson
- Journal
- Astronomy & Astrophysics
- Volume
- 440
- Pages
- 295-303
- No. of pages
- 9
- ISSN
- 0004-6361
- DOI
- https://doi.org/10.1051/0004-6361:20053076
- Publication date
- 2005
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103003 Astronomy
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/e492e055-25c5-4878-8c4c-d12bf21d9e7a