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Cluster of Older Stars- Red Giants
Transcript of Cluster of Older Stars- Red Giants
Red Giant What is a Red Giant? Stellar Evolution The Coming of a Red Giant Betelgeuse The Future of Betelgeuse Future Red Giants A Red Giant is a large star of great luminosity
and low surface temperature. Stellar Evolution is the process which a star
changes during its lifetime. A star becomes a Red Giant after all the hydrogen has been consumed from nuclear fusion reactions. Energy is generated from the hydrogen fusion in the stars shell Betelgeuse is a red giant and the 8th brightest star in the sky and the 2nd brightest in the Orion constellation. Over time, Betelguese will run out of fuel, be too strong for itself, then have a supernova explosion. This will most likely not happen in our lifetime. Red Giants are usually the brightest stars in the sky besides supernovas. They get so bright from their enormous size.
Red Giants will eventually go through the stage of being a Blue Giant They appear to be yellow orange to red A Red Giant is in the last phase of its life A star will eventually reach the red giant phase after it goes through the subgiant stage. This takes place in the core of the star A nuclear fusion reaction converts hydrogen to helium The core collapses until hydrogen fusion starts in a hot shell around the core The Coming of a Red Giant The energy causes the star to expand in diameter The star becomes a red giant once the gas expands and it cools. It is 700 million miles in diameter It is 7,500 times brighter than the sun Betelgeuse surface temperature is 6000 degrees fahrenheit. It is orange-red Works Cited