Abstract
We present mid-infrared Spitzer Space Telescope Infrared Spectrograph (IRS) spectroscopy of the prototype WN star EZ Canis Majoris (HD 50896, WN4b). Numerous stellar wind lines of He II are revealed, plus fine-structure lines of [Ne III] 15.5 μm and [O IV] 25.9 μm. We carry out a spectroscopic analysis of HD 50896 allowing for line blanketing and clumping, which is compared to the mid-IR observations. We make use of these stellar properties to accurately derive Ne/He = (1.2-1.8) × 10-4 and O/He = (4.2-4.8) × 10-5 by number, for the first time in an early WN star. In addition, we obtain N/C ~ 40 and N/O ~ 50 by number, in perfect agreement with current predictions for rotating massive stars at the end of interior hydrogen burning.
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