A unique period for the WN5 star EZ CMa

Details A unique period for the WN5 star EZ CMa A unique period for the WN5 star EZ CMa

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107.2179a&link_type=abstract

The Astronomical Journal (ISSN 0004-6256), vol. 107, no. 6, p. 2179-2183

Astronomy and Astrophysics

Astronomy

15

Astronomical Photometry, Binary Stars, High Resolution, Light Curve, Wolf-Rayet Stars, X Ray Binaries, Polarization, Stellar Magnitude, Stellar Spectra, X Ray Sources

Scientific paper

We have obtained three months (mid Feb.-mid May 1993) of uninterrupted, precision, narrowband visual, continuum photometry of EZ CMa which allows a viable search for periodicities at unprecedented high resolution in the frequency domain. We find only one independent significant period, P = 3.76d, as first claimed in 1980. The phased light curve shows complex structure (3peaks) but a high level of coherency during the first approximately 8 weeks. A sudden change leads to a different, but still coherent, light curve during the last approximately 4 weeks. Since only one period persists, it must have its origin either in rotation as a single WR star (e.g., oblique rotator) or in a binary (e.g., with a compact companion).

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