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| Paper: |
Short-Term Spectroscopic Variability of WC9 Stars |
| Volume: |
465, Four Decades of Massive Star Research - A Scientific Meeting in Honor of Anthony J. Moffat |
| Page: |
169 |
| Authors: |
Desforges, S.; St-Louis, N.; Chené, A.-N. |
| Abstract: |
We present a preliminary report of a monitoring campaign in the optical of nine presumably single WC9 stars. Large-scale line profile variability is present for each star of our sample. We measured the radial velocities, equivalent widths, skewness, and kurtosis of the
C III λ5696 line for each spectrum in order to search for periods that could indicate the presence of corotating interaction regions (CIRs) in the stellar wind or an undetected companion. Our goal is to determine the origin of the spectroscopic variability and to provide new information on the dust formation process in single WC9 stars. We detect a period of 4.5 ± 0.3 days in the radial velocity curve of WR 103 with an obvious anti-correlation between the skewness and radial velocities indicating line-profile changes rather than an orbit. This indicates that if a companion is present the radial velocity amplitude is very small. |
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