Astronomy 100 HW #8a

Astronomy 100 HW #8a - Astronomy 100 HW #8 1) The...

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Astronomy 100 HW #8 1) The characteristic that defines main sequence stars is that they fuse hydrogen and helium in their core to create energy. Main sequence stars have proportional Luminosity and Temperature. 2) Less massive stars have a longer lifetime. This is because the mass of a star determines how much fuel it starts with, and the luminosity determines how quickly the star uses that fuel. The mass of larger stars isn’t proportionally as much larger as the luminosity. So even though more massive stars have more fuel to burn than less massive stars, the more massive stars have a much higher luminosity so that the fuel burns much quicker than in less massive stars, meaning the less massive stars last longer. 3) a. b. The H-R diagrams of open clusters have the main sequence in one complete straight line. The diagrams for globular clusters have a turnoff point where the main sequence forms a bent line. 4) When the hydrogen in a star begins to run out the star develops a hydrogen- burning shell and the outside layers of the star grow. Simultaneously, the core contracts, which releases energy and heats the core so that helium is fused into
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This note was uploaded on 04/20/2008 for the course ASTR 100 taught by Professor Hayes-gehrke during the Spring '06 term at Maryland.

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Astronomy 100 HW #8a - Astronomy 100 HW #8 1) The...

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