Linked from
The 20 pages that link to Wolf–Rayet star, each with the reason it gives.
Stellar windRelated: Its powerful wind can remove much of the star’s outer layers.
Stellar mass lossBroader topic: Its strong wind exposes layers processed by nuclear fusion.
Cassiopeia ARelated: Cassiopeia A’s progenitor likely shed most of its hydrogen before exploding.
Triangulum GalaxyRelated: M33 contains observed Wolf–Rayet stars that trace massive-star evolution.