AST Midterm 3 Review

AST Midterm 3 Review - 1 - Stars are born from the...

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1 - Stars are born from the gravitational collapse of a gas cloud. They strive to maintain balance between pressure and weight. Low mass stars are stars that are born with masses less than 8Msun. Hydrogen fusion begins and the low mass stars reach the Red Giant stage when hydrogen runs out in its core. The core contracts allowing it to heat up and when it is hot enough helium fusion occurs. Helium is converted into carbon, which produces energy. Once all the helium is converted the stat begins to shut down. After helium fusion a star glows brightly as a planetary nebula, it ejects the outer layers, and the core is left behind as a White Dwarf. 2 - Stars are born from the gravitational collapse of a gas cloud. They strive to maintain balance between pressure and weight. The higher the mass of a star the higher, the temperature at its core, the faster fusion, and the shorter it lives. High Mass Stars are stars that are born with a mass above 8Msun. The first steps resemble those of a low mass star, but proceed much faster. When temperature at the core sufficiently high, star begins fusing H into He at the core. After a few million years, when H depleted, the core contracts and the temperature increase. H fusion in a shell surrounding the core begins. The star expands into a red supergiant. The sequence of steps keeps repeating itself, with heavier and heavier elements under going
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fusion. The star fuses, H, He, C, O. The stars produce the elements we are made of.
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This test prep was uploaded on 04/21/2008 for the course AST 104 taught by Professor Dontremember during the Fall '08 term at Syracuse.

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AST Midterm 3 Review - 1 - Stars are born from the...

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