Addressing the Question Posed by the Of?p Stars: HD191612
There are three known Of?p stars in our galaxy, they are the well known peculiar stars HD108, HD148937 and HD191612. The question mark in their spectral classification was introduced by Walborn (1972) to indicate doubt that these stars are normal Of supergiants. They are characterised by their CIII 4647, 4650, 4651 emission lines being comparable
Lennon, D. J. et al.
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