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Why the Sun Shines

by: Alyssa Karounos

Why the Sun Shines Astr 1010-100

Alyssa Karounos
GPA 3.9
Introductory Astronomy 1
Dr. Oliver Fraser

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About this Document

One day of notes on the lecture that explains what makes a star a star
Introductory Astronomy 1
Dr. Oliver Fraser
Class Notes
astronomy, sun, shines
25 ?




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This 2 page Class Notes was uploaded by Alyssa Karounos on Friday February 13, 2015. The Class Notes belongs to Astr 1010-100 at University of Washington taught by Dr. Oliver Fraser in Winter2015. Since its upload, it has received 93 views. For similar materials see Introductory Astronomy 1 in Astronomy at University of Washington.


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Date Created: 02/13/15
2 13 1 5 I Goals A Explain what makes a star II Giant stars have radii 10100R and luminosities have 1001000L Their masses are close to main sequence stars Red giants are stars that are like the sun or the same mass so they all weigh the same Nothing changes with mass in evolution III Which HR Diagram has stars all the same age A The one with the stars all on the main sequence or following the main sequence or are following the turn off all have the same age If a diagram has a gap on the main sequence and the turn off they are not all the same age IV What HR diagram has stars of all the same distance A If they are all the same age then they are in a cluster and all the same distance V How much more massive is the sun than Jupiter A Sun 19 X 103 0 kg B Jupiter 19 X 1027 kg C Jupiter is not a failed star Jupiter is 1000 times smaller than the sun VI Hydrostatic Equilibrium in Stars speci cally the Sun A balance of weight of gas alone and pressure supporting the gas in the sun formation of the sun led to a hot 15 X 106 k dense 150 g km 3 core stratified structure hotter on the inside than outside if you compress a gas it heats up the sun s stability is due to it s hydrostatic and it s energy equilibrium middle generates energy Albert Einstein Emc2 the amount of energy you get from mass is a lot VII Nuclear Fusion in the Sun A not fission breaking apart last for billions of years WWUOW 53 very temperature dependent T4 bare protons of positive charges moving fasting enough form He difference in mass of 4 H nuclei into He produces energy by product is He and WWUOW lost of energy VIII Neutrino A super small particle given off by the sun B very hard to detence but they eXist C proves nuclear fusion in sun D nuclear fusion is the only efficient energy source we know and we found neutrinos so it must be it IX In the sun A gas is boiling B sun spots 1 has strong magnetic eld and is made mostly of plasma 2 equator rotates faster than pole which stretches the eld lines to become tighter C solar are 1 throws materials out into space 2 magnetic eld pushed of the sun 3 ows into the earth s magnetic eld 4 can see northern light from observing magnetic absorption


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