Editing Stellar classification (section)

====Slash stars====
{{Main|Slash star}}
The ''slash'' stars are O-type stars with WN-like lines in their spectra. The name "slash" comes from their printed spectral type having a slash in it (e.g. "Of/WNL")<ref name="Walborn">{{cite journal |bibcode=2008RMxAC..33....5W |title=Multiwavelength Systematics of OB Spectra |journal=Massive Stars: Fundamental Parameters and Circumstellar Interactions (Eds. P. Benaglia |volume=33 |pages=5 |last1=Walborn |first1=N. R. |year=2008}}</ref>).

There is a secondary group found with these spectra, a cooler, "intermediate" group designated "Ofpe/WN9".<ref name="Walborn"/> These stars have also been referred to as WN10 or WN11, but that has become less popular with the realisation of the evolutionary difference from other Wolf–Rayet stars. Recent discoveries of even rarer stars have extended the range of slash stars as far as O2-3.5If<sup>*</sup>/WN5-7, which are even hotter than the original "slash" stars.<ref>{{Cite journal |last1=Crowther |first1=P. A. |last2=Walborn |first2=N. R. |doi=10.1111/j.1365-2966.2011.19129.x |title=Spectral classification of O2-3.5 If*/WN5-7 stars |journal=Monthly Notices of the Royal Astronomical Society |volume=416 |issue=2 |pages=1311–1323 |year=2011 |doi-access=free |arxiv=1105.4757 |bibcode=2011MNRAS.416.1311C|s2cid=118455138 }}</ref>