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Life Cycle of Stars |
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As soon as astronomers could begin to measure different properties of stars, they began to categorize the stars. Stars come in a wide variety of forms: massive and not so massive, large and small, bright and faint. All stars pass through a variety of evolutionary stages. Stars of different initial mass evolve at different rates and into different final forms (Gallant, 1980). ... The following sequence summarizes the evolution of stars according to the groups on the H-R diagram Prostar Pre-main sequence Main sequence Giant Variable or unstable White dwarf or other small star The protostar stage In certain regions of space, the density of gas and dust may be 10,000 times greater. ... Several types of observed objects are believed to relate to late protostellar stages or pre-main-sequence stages of star formation: Bok Globules (dense clouds of dust), infrared stars and cocoon nebulae. ... Because stars form with a huge supply of hydrogen, stars remain stable on the main sequence for a relatively long time at a fixed size. ... Most variable stars apparently represent postgiant stages of evolution. ... White dwarfs or Supernoave As the outer atmospheres of evolved stars expand, some of the gas may be blown entirely free of the star. ... A flash story about the Sun The Sun began its life as a cool, dim interstellar cloud. |
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Title: Life Cycle of Stars
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