Wolf-Rayet Subtypes

Hello Explorers,

I just happened upon a "Wolf-Rayet N" star, wich has the standard description text of star type "Wolf-Rayet" plus the sentence "This star is a variant of the wolf-Rayet stars whose spectrum is dominated by ionised nitrogen and helium lines."

There appear to be vague rumours of variants "C" and "O", has anyone actually seen those? Do you happen to remember the exact description text?

Thank you,

TLE
 
I have found 3 Wolf-Rayet stars so far, all of them had the following at the end of the description

"...dominated by ionised oxygen lines"
 
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