december 16, 2011
DESCRIPTION
December 16, 2011. Objective: Construct a model of the life of a star. Agenda Notes Life of a Star Project Contact. Life Cycle of a Star. 1 st Stage of Life Ball of gas and dust that is pulled together by gravity Nuclear fusion starts as gas cloud becomes denser and hotter - PowerPoint PPT PresentationTRANSCRIPT
December 16, 2011
Objective: Construct a model of the life of a star
Agenda Notes Life of a Star Project Contact
Life Cycle of a Star
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
Four types of stars make up the life of a starMain SequenceGiants Super GiantsWhite Dwarfs
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
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
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)
Age of starsAverage stars become red giants then white dwarfs
More massive stars explode into a variety of objects
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
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
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
Question 1
What kind of a star is the sun?
Answer
Main Sequence
Question 2
What is the H-R diagram?
Answer
A graph that shows the relationship between a star’s temperature and absolute magnitude
Question 3
What are the four main types of stars?
Answer
Main-SequenceGiants and Supergiants
White Dwarfs