Helium-rich O-type stars show nitrogen abundances that do not match single-star model predictions and are interpreted as binary interaction products, while helium-normal stars align better except for luminosity class III objects where models overpredict enrichment.
C.5.Results of the analysis of synthetic spectra from FASTWIND models
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The IACOB project: XVII. Nitrogen abundances in Galactic O-type stars: further hints for separating binary-interaction products from effectively single stars
Helium-rich O-type stars show nitrogen abundances that do not match single-star model predictions and are interpreted as binary interaction products, while helium-normal stars align better except for luminosity class III objects where models overpredict enrichment.