Photometry and polarimetry of the unusual WN5 star EZ Canis Majoris

Details Photometry and polarimetry of the unusual WN5 star EZ Canis Majoris Photometry and polarimetry of the unusual WN5 star EZ Canis Majoris

Aug 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343..426d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. 426-436. Research supported by the Space Telescope Sc

Astronomy and Astrophysics

Astrophysics

34

Astronomical Photometry, Binary Stars, Polarimetry, Stellar Evolution, Wolf-Rayet Stars, Circular Polarization, Light Curve, Stellar Color, Stellar Rotation, X Rays

Scientific paper

New high-precision polarimetric data (based on four observing runs spanning 16 months and a nearly contiguous 62-night photometric run) are presented for the unique Wolf-Rayet star of type WN5, EZ CMa. Even though the shape of the polarization curve changes from one run to the next, the previously known 3.77-d period is always present in each run of data; no significant circular polarization variation is detected. The data are interpreted in terms of a binary system with a low-mass (probably compact) companion or rotating spots on a single star. The former is preferred; if correct, EZ CMa would fill the heretofore missing link in the evolution of massive binaries.

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