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EZ (Easy?) Canis Majoris

  • C. Robert (a1), A. F. J. Moffat (a1), L. Drissen (a2), V. S. Niemela (a3), P. Barrett (a4), W. Seggewiss (a5) and R. Lamontagne (a1)...

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EZ CMa (HD 50896, WN5) is an enigmatic object. New photometry and polarimetry of EZ CMa are presented in the figure. Again the 3.77 day period is found but, as observed at previous epochs (e.g. Drissen et ai. 1989, Ap. J., 343, 426), the shapes of the curves change. The new photometry can also be interpreted in terms of a shorter period, of 1.254 days. A period of about one day is also claimed in other sets of photometric data (e.g. van der Hucht et ai., 1990, A. A., 228, 108) and in the IUE spectra of St.-Louis et ai. (1990, this symposium). However, despite the complex nature of the light curve, the 3.77 day period is strongly supported by the polarimetry, which shows no evidence for the shorter period.

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