Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004apjs..154..413m&link_type=abstract
The Astrophysical Journal Supplement Series, Volume 154, Issue 1, pp. 413-417.
Astronomy and Astrophysics
Astronomy
21
Infrared: Stars, Stars: Atmospheres, Stars: Individual: Henry Draper Number: Hd 50896, Techniques: Spectroscopic
Scientific paper
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.
Crowther Paul A.
Houck Jim R.
Morris Patrick W.
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