The nitrogen seen in the spectrum of WNh stars is still the product of CNO cycle fusion in the core, but it appears at the surface of the most massive stars due to rotational and convectional mixing while still in the core hydrogen burning phase, rather than after the outer envelope is lost during core helium fusion.
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Hydrogen burning is an expression that astronomers sometimes use for the stellar process that results in the nuclear fusion of four protons to form a nucleus of helium-4 . ( This should not be confused with the combustion of hydrogen in an oxidizing atmosphere . ) There are two predominant processes by which stellar hydrogen burning occurs.
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