Topic 3.4 - Evolution of Stars

  • Created by: goldstar3
  • Created on: 04-06-18 21:41

A) Birth of Stars

  • Stars formed from clouds of gas and dust called nebulae
  • Breaks down to protostars
  • GPE to KE
  • Temp reaches 15 million K
  • Nuclear fusion begins
  • Outward pressure stops collapse
  • Begins to radiate energy
  • Is now main sequence
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B)

  • Emission nebulae, absorption nebulae, open clusters 
  • All associated with birth of stars
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C)

  • Planetary Nebulae associated with birth of stars
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D) Neutron Stars

  • Neutron stars have masses slightly greater than the Sun's
  • Have a diameter of just 20km
  • High density
  • Strong gravitational effect
  • Rotates rapidly on axis
  • Pulsars emit pulses of radio waves
  • Intense radio waves from polar regions
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D) Black Holes

  • When stars greater than 3 solar masses
  • High density and gravitational pull
  • EM radiation unable to escape
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E) Evidence of neutron stars & black holes

  • X-ray sources produced by accretion discsGas pulled off visible star
    • in binary star systems
  • Gas in orbit around black hole
  • Friction heats the gas to be detected by x-rays
  • Neutron stars detected as pulsars

 

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