Extreme this is known as the helium this flash flash

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Unformatted text preview: oceeds at an extreme rate. extreme This is known as the helium This flash. flash The star has now reached The stage 10. stage Stellar Evolution Stellar Evolution Solar­Mass Star Helium fusion occurs at a high temperature than Helium hydrogen fusion and does not release as much energy. hydrogen Therefore the star passes through the helium fusion Therefore stage much more rapidly. ~50,000,000 years. stage During this time a core of Carbon is produced. Eventually helium is depleted in the core and a shell of Eventually helium fusion will result. helium This is surrounded by a shell of hydrogen fusion. Now the star swells enormously and becomes a red supergiant. (stage 11) Once the star becomes a red supergiant the outer layers are ejected from the star. Stage 12) The hot core produces considerable UV light. considerable This causes the ejected This outer layers to fluoresce. outer The star is now The surrounded by a planetary nebula. nebula. Stellar Evolution Stellar Evolution High­Mass star Stellar Evolution Stellar Evolution Solar­Mass Star Some planetary Some nebulae have very strange shapes. strange NGC 2371 NGC The central star of this planetary The is the hottest known. 240,000 K. is Stellar Evolution Solar­Mass Star The planetary nebula s...
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This note was uploaded on 08/27/2013 for the course ASTRO 1402 taught by Professor Clark during the Fall '11 term at Texas Tech.

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