| タイトル | On the wind geometry of the Wolf-Rayet star EZ Canis Majoris |
| 著者（英） | Anderson, C. M.; Bjorkman, K. S.; Taylor, M.; Schulte-Ladbeck, R. E.; Magalhaes, A. M.; Nordsieck, K. H.; Nook, M. A. |
| 著者所属（英） | Wisconsin Univ. |
| 発行日 | 1991-11-20 |
| 言語 | eng |
| 内容記述 | Recent models of Wolf-Rayet star winds have been tailored to EZ CMa, and make predictions of the envelope structure and location of line-emitting regions. It is discussed how the wind structure of EZ CMa can be probed observationally through electron distribution integrals as measured by spectropolarimetry, and then present, analyze, and interpret a time-dependent spectropolarimetric data set of EZ CMa. The observations further the view of an electron-scattering wind that is axisymmetric, rotating, and expanding, with a variable mass-loss rate being responsible for the quasi-periodic polarimetric variability. It is demonstrated that the emission lines of EZ CMa are partially polarized, indicating that line photons are electron-scattered in the wind. The polarization in N V lambda 4945 and N IV lambda 4058 is observed to be larger than that of He II lambda 4686 and He I lambda 5876, as expected from ionization stratification. |
| NASA分類 | ASTROPHYSICS |
| レポートNO | 92A13506 |
| 権利 | Copyright |
| URI | https://repository.exst.jaxa.jp/dspace/handle/a-is/331183 |
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