Popular in Stellar Astronomy
Popular in Astronomy
This 3 page Bundle was uploaded by Daniela Hernandez on Saturday December 6, 2014. The Bundle belongs to AST2004 at Florida International University taught by Dr. Terenzi in Fall. Since its upload, it has received 237 views. For similar materials see Stellar Astronomy in Astronomy at Florida International University.
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Date Created: 12/06/14
January 15th 2014 Danish astronomer Herztsprung and American Russell created the HR diagram MS main sequences on the yellow line elongated s are doing hydrogen fusion very luminous stars hot and young stars Stars that are not main sequence in the HR diagram are the giant G while the other are called the super giants SG these two make up only the 1 on the stars in the universe Complete the HR Diagram by friday white dwarfs make up the 9 of stars very very small stars WD giant red stars temperaturecool will end its life as a white dwarf radius 10100 radius of our sun luminosity 1001000 luminosity of our sun temperature 30006000 K Ex aldebaran taurus arturus bootes super giants radius 1001000 radius of our sun luminosity above 1000 luminosity of our sun Ex Betelgeuse orion antares scorpio white dwarves hot stars a left over energy from giant stars no hydrogen fusion happening at the core shine is of residual left over heat lose of all their heat to space and are not able to create any other type of energy whatsoever crystalized stars undetectable in the future small dimmer and dimmer in time eventually until they lose all of their energy not visible to the naked eyes size as big as our planet main sequence 90 of all stars ranges from hot blue stars to cooler red starsred dwarves red cool small Brown dwarves located under the red dwarves extreme lower right of the main sequence off the bottom Objects that would never ever become stars not main sequence stars similar to jupiter small but do not have enough mass to trigger hydrogen fusion More than 5060 of stars in the universe are born with a companion creating a binary star system with one star orbiting around the other one the center of mass being the center of the ellipsis jupiter as a failed star not a companion to our sun jupiter as a giant KFC kelvin UK absolute zero Ok not atomic motion ice 273 100 boiling 373 Celsius ice 0 boiling 100 Fahrenheit ice 32 F boiling 212 F HW finish the HR diagram Compute the temperature of space in the C and F temperatures systems compute the temperature of our sun surface in C and F January 22nd 2013 Chapter 18th The Birth of Stars left over space from death stars form a nebula full of hydrogen helium and dust just huge gas clouds that usually tend to be cool when you cool a gas the gas tends to contract with the gas heading towards the center of the nursery for the stars as soon as the gas contract there is the creation of a protostar The protostar would become a star when hydrogen infusion begins to happens at the core of the star as soon as hydrogen fusion stars to happen there is the birth of a new star new stars are placed on the main sequence ob stars the next step on the star life would be to reach middle age sun G2 last step would death lots of iron in the core of the star when the stars are ob there are lots of ultraviolet radiation a star lifespan is around 10quot10 years our sun if 5 B years old Gravity outside the star is counterbalanced by the pressure inside the star which is exactly the same as the gravity outside of the star however when gravity outside of the star becomes greater than the intemal pressure of the star then the star begins collapsing on itself and ergo beginning the process of death the star then will become a white dwarf if the pressure inside the star is stronger than the gravity outside of the star then the star would begin expanding in size the star then would be classified as a super giant or giant interstellar medium condense on itself when this happen the density in the nebula increases for the star to be born the nebula must be cold because when the temperature decreases the gases cool down and contract pressure inside the nebula must be as low as possible for gravity to make the gasses condensing faster dark nebulas one of the most perfect place for star formation ex Horeshead Nebula protostar the dark dust cool gas condensed nebula is a nursery star birth 1000years to less than 1 M hydrogen atoms for molecules dust and gas started at the beginning of the universe with the explosion of the Big Bang at the beginning the universe was pure energy temperature we cannot count
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