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EZ (Easy?) Canis Majoris

Published online by Cambridge University Press:  03 August 2017

C. Robert ,
A. F. J. Moffat ,
L. Drissen ,
V. S. Niemela ,
P. Barrett ,
W. Seggewiss  and
R. Lamontagne
C. Robert
Affiliation:
1Université de Montréal, Montréal, Canada;
A. F. J. Moffat
Affiliation:
1Université de Montréal, Montréal, Canada;
L. Drissen
Affiliation:
2Space Telescope Science Institute, Baltimore, U.S.A.;
V. S. Niemela
Affiliation:
3IAFE, Buenos Aires, Argentina;
P. Barrett
Affiliation:
4SAAO, Cape, South Africa;
W. Seggewiss
Affiliation:
5Observatorium Hoher List, Universitäts-Sternwarte Bonn, F. R. Germany
R. Lamontagne
Affiliation:
1Université de Montréal, Montréal, Canada;

Extract

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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.

Type
Session III. Intrinsic Variability
Information
Symposium - International Astronomical Union , Volume 143: Wolf–Rayet Stars and Interrelations with other Massive Stars in Galaxies , 1991 , pp. 181
Copyright
Copyright © Kluwer 1991