Spectra of Wolf-Rayet Stars

Star	WR142	RA (J2000)	20 21 44.3
Constellation	Cygnus	Dec	+37 22 30.5
Mag (V)	12.96	Other names
Notes

HAG 24" RC, ZWO ASI2600MM Pro, Lhires III, 300 gr/mm, 4 x 600 sec, 2022-08-27@22:32

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).