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development from the massive blue supergiant star, which is on the verge of blowing apart by the enormous radiation pressure. It occupies a region in the H-R diagram, where the surface temperature is 30,000oK and the luminosity is 106 times that for the Sun. It throws off so much material that the inside of the star generated by nuclear fusion such as helium, carbon, nitrogen and oxygen, become visible. It is designated as WN, WC, or WO stars depending on whether it is enriched in nitrogen, carbon or oxygen (Figure 08-12b). Eventually, the successive nuclear fusions turn the core into iron. Then it will go supernova and collapse to either a neutron star or black hole
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