EZ CMa UBV & VBLUW photometry (Duijsens+, 1996)

Details EZ CMa UBV & VBLUW photometry (Duijsens+, 1996) EZ CMa UBV & VBLUW photometry (Duijsens+, 1996)

Feb 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996ycat..41190037d&link_type=abstract

VizieR On-line Data Catalog: J/A+AS/119/37. Originally published in: 1996A&AS..119...37D

Other

Stars: Wolf-Rayet, Photometry: Vilnius, Photometry: Ubv

Scientific paper

We present and analyse photometric and spectroscopic observations of the WN5 star EZ Canis Majoris obtained over a period of 7 years. We discuss the changing light curve, the shift in phase of the maxima and point to flare type variability seen in one night. Small amplitude variations are reported in another night. We have investigated the change of the average visual magnitude over a time span of 18 years and found a tentative cyclic variation with a time scale of 2425d (6.6yr) with a range of ~0.07mag. This, of course, should be verified. If true, a precession phenomenon may offer an explanation. The trend of the maximum light amplitude of the 3.766d cycle is also investigated and it shows a saw-tooth character with a timescale of ~400d. A possible relation with the magnetic activity of the star is discussed. We conclude that the line emission variability can be caused by both a single star model with an ever-changing wind and a binary (WN+NS) model. (3 data files).

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