Wolf-Rayet (WR) stars are stars showing prominent broad emission lines of ionized helium and highly ionised nitrogen or carbon. The spectra indicate very high surface enhancement of heavy elements, depletion of hydrogen, and strong stellar winds. The surface temperatures of known Wolf-Rayet stars range from 20.000 K to around 210.000 K, hotter than almost all other kinds of stars. WR 134 is actually one of the original WR stars discovered by astronomers Charles Wolf and Georges Rayet in 1867.

WR 134 has shed its atmosphere, which is now shocked by the hot, fast winds of the WR star to form a visible bubble. It is most easily observable in the light of ionized oxygen ([OIII]) and thus appears turquoise in images of the WR bubble. The WR 134 itself is visible as the brighter star near the apparent center of the bubble.

Other objects in this image include two barely conspicuous open star clusters: NGC 6883 (below WR 134) and NGC 6871 (to the lower right), the large red emission nebulae LBN 182 (below WR 134) and LBN 187 (above and to the right of WR 134) and a few dark nebulae, most notably Barnard 147 near the lower right corner of the image.

WR 134 - Wolf-Rayet Bubble in Cygnus, which this image is part of.