Week 6 Notes
Week 6 Notes FDSCI209 03
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This 4 page Class Notes was uploaded by Breanne Jamieson on Monday October 26, 2015. The Class Notes belongs to FDSCI209 03 at Brigham Young University - Idaho taught by Brother Tonks in Fall 2015. Since its upload, it has received 20 views.
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Date Created: 10/26/15
Stars form in nebulae The different densities of the gas and dust start pulling on each other and fragment Gravitational collapse releases energy keeping the collapsing cloud cold As each fragment collapses it spins to conserve angular momentum Eventually the center of the condensing clump begins to warm up as the gas and dust trap the gravitational collapse energy As the center warms up it s spinning speed slows down and a proplyd forms disk of dust and gas around the newly forming star This gas and dust form planets around the star and the remaining material is either added to the planets or star or blasted into space We cannot see the entire process of the birth of a star but we can see snapshots of the process as we look into space and see different stars at different stages of their birth We make assumptions based on the laws of physics that we currently understand and piece together the process as best as we can The HR Diagram plots out stars according to their luminosity brightness and their temperature color This also allows us to see visually how the luminosity and colortemperature of a star correlates to its size and lifespan Super giants are at the top of the chart with blue on the left and red on the right The main sequence stars are more in the middle of the chart off a bit to the right in the yellow range and red dwarfs are in the bottom left of the chart Stars must be hot for fusion to occur Atoms repel each other naturally but the energy from the heat overcomes that and compresses them so they can fuse The conditions needed for fusion extreme heat and extreme pressure occur only in the deep layers of the star The stars also require a minimum mass because the larger the mass the greater the gravity to increase pressure and heat If stars do not have enough mass and gravity they never get hot enough to turn onquot nuclear fusion