Erratum: the 2.27 day period of WR-134 (HD 191765) |
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Authors: | Stephan R McCandliss Bruce Bohannan Carmelle Robert Anthony F J Moffat |
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Institution: | (1) Dept. of Physics and Astronomy, The Johns Hopkins University, 21218 Baltimore, MD, Canada;(2) Kitt Peak National Observatory, 950 N. Cherry Ave, 85726-6732 Tucson, AZ, Canada;(3) Space Telescope Science Institute, 3700 San Martin Dr, 21218 Baltimore, MD, Canada;(4) Département Physique, Université de Montréal, C.P. 6128, Succ. A, H3C 3J7 Montréal, Qc, Canada |
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Abstract: | The original temporal analysis of a 12 night spectral timeseries of WR-134 has been found to be flawed and a re-analysis shows that the line profile variations are indeed periodic. When combined with a 4 night timeseries taken 45 days earlier, a period near 2.27 d is found in periodograms of the Heii 5412 line centroid,rms line width, and line skew variations. When the emission line residuals are ordered as a function of phase, a sinuous feature appears to snake about the line center with an amplitude of ± 500 km s–1. This is 20 larger than the line centroid amplitude; the calculation of which is heavily weighted by static portions of the line profile. In addition to the snake, emission residuals appear that move away from line center on unbound trajectories and are thought to result from the interaction of a periodic driver with the unstable flow of the radiation driven wind. The nature of the periodic driver is a topic for discussion. |
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Keywords: | Line: Profiles Stars: Variable Stars: Wolf-Rayet |
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