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Unformatted text preview: Interstellar polluters pulsations can dredge up carbon and oxygen from the core, and eject it into the interstellar medium. Stars with carbon rich atmospheres are called carbon stars. The end of fusio n In a low-mass star, the core temperature never grows hot enough to fuse carbon (some He fuses to C to make O) left with a hot carbon and oxygen core. Planetary nebulae 7) Pulsations become violet and eject outer layers, producing a planetary nebula Why does a planetary nebula grow? The ejected layers are excited by radiation from the hot core Lasts only ~1million yrs....
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- Winter '09