December 16, 2011
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Transcript of December 16, 2011
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December 16, 2011
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Objective: Construct a model of the life of a star
Agenda Notes Life of a Star Project Contact
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Life Cycle of a Star
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1st Stage of LifeBall of gas and dust that is pulled together by gravity
Nuclear fusion starts as gas cloud becomes denser and hotter
Nuclear Fusion hydrogen atoms fuse into heliumCreates the intense energy found in stars
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Four types of stars make up the life of a starMain SequenceGiants Super GiantsWhite Dwarfs
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Main Sequence (the Sun)2nd stageLongest stageHydrogen changes into helium which creates enormous amounts of energy
The size of the star does not change much
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Giants and Supergiants3rd stageMain Sequence star becomes a red giant
Red giant star that expands and cools once is loses all its hydrogenCenter shrinks and atmosphere grows large and cools
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White Dwarf small hot star that is the leftover center of an older starFinal stageCan shine for billions of years before they extinguish
Observe life of a star (link)
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Age of starsAverage stars become red giants then white dwarfs
More massive stars explode into a variety of objects
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Supernova gigantic explosion in which a massive star collapses Occurs after a massive star uses up its fuel source
Neutron Star a star that has collapsed to a point at which all particles are neutronsA neutron star that spins and sends out beams of radiation is called a pulsar
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Black Hole an object that is so massive that light cannot escape its gravityRemnants of a supernova
Astronomers can detect black holes by using X-ray telescopes
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Hertzprung-Russell DiagramShows the relationship between a star’s surface temperature and absolute magnitude
Used to study the lives of stars
Most stars lie along the main sequence portion of the diagram
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Question 1
What kind of a star is the sun?
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Answer
Main Sequence
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Question 2
What is the H-R diagram?
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Answer
A graph that shows the relationship between a star’s temperature and absolute magnitude
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Question 3
What are the four main types of stars?
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Answer
Main-SequenceGiants and Supergiants
White Dwarfs