Spectra of Wolf-Rayet Stars

This star, of spectral classification WO2, is one of the very few known oxygen-sequence Wolf-Rayet stars.
It is one of the hottest known with a surface temperature of 200,000 K, which results in the very wide emission lines.
It is nearly 1 million times more luminous than our Sun and about 1650 LY distant.

WO Wolf-Rayet stars are the last evolutionary stage of the most massive stars before exploding as supernovae,
possibly with a gamma-ray burst (GRB).