one has identified any bona-fide examples
of [WN] stars to date in the Wolf-Rayet central stars of planetary nebulae. Several [WN]
candidates have been proposed, but most
have turned out to be massive WN stars,
since around 1 in 10 of them are also surrounded by nebulae. The most infamous
example is WR 124 and its ejecta nebula M
1-67.
A Serendipitous Discovery
Figure 1. Gemini South GMOS spectroscopy of the planetary nebula IC
4663’s central star (black) and two massive WN stars of a similar