Quiz 6

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  1. Where a white dwarf is in a close binary is a ______.
    Norae (Stellar Explosion)
  2. What happens in a Type 1 Supernovae?
    • White dwarf in a binary (again.)
    • Mass transfer until >1.4 solar mass
    • Rapid collapse
  3. Describe the mass and temperature in a Type 2 Supernovae.
    • Mass > 8 solar masses
    • Temperature > 1010 K
  4. What are some characteristics of Pulsars?
    • Rapid and very regular pulse period
    • Found in disk of our galaxy
    • Whear star-like object
  5. What is the theory of Pulsars?
    Dense objects can oscillate, rotate, and revolve rapidly
  6. What are some predictions of relative motion?
    • Lengths contract
    • Time intervals increase
    • Masses increase
  7. Describe General Relativity.
    • no more restriction to constant velocities
    • a "new look at gravity"
    • Mass distorts the geometry of space
  8. What are the four tests for verifying General Relativity?
    • Mercury's orbit
    • Distortion of star positions near eclipsed sun
    • Gravitational Redshift
    • Energy loss to gravitational waves
  9. A dark star of more than 7 solar masses, _____.
    cannot be a white dwarf or neutron star
  10. What happens around a black hole?
    • Supergiant fills its Roch lobe and loses mass
    • Infalling mass in 4-million km whirlpool around black hole
  11. Describe the Milky Way's size and shape.
    • Diameter: 160,000 LY
    • Thickness: 1,000 LY
  12. How long does it take to make one orbit of a Galactic Rotation?
    230 Million years
  13. What are some "Dark Matter Candidates"?
    • Dead Stars- White dwarfs, neutron stars, black holes
    • Brown dwarfs-objects too small to be stars
    • Asteroid-size matter
  14. Population I in the galaxy. What is in it?
    • Disk
    • Gas and Dust
    • Bluer
    • Younger
    • Reproessed Elements
  15. Population II. What is in it?
    • Halo
    • No Gas and Dust
    • Redder
    • Older
    • Primitive Elements
  16. Spiral arms can be traced by finding ____.
    • Young stars
    • Gas and Dust
    • Older stars NOT concentrated in the arms
  17. What is the Spiral Structure Theory?
    • Waves are spiral density waves
    • Differential rotation
    • Influence of fresh, massive stars
    • Influence of nearby galaxies (tides)
  18. Why is the Galactic center not seen at visible and UV wavelengths?
  19. What do Infared, radio, and x-ray observations show?
    • Greater star density
    • Radio-emitter SgrA
    • High speed rotating disk of a few per radius
    • x-ray emission
  20. Galaxy type determined by ______.
    • Density (star formation rate)
    • Angular momentum (spin)
    • Interactions with neighbors
  21. What indicates distance in galaxies?
    Relative "faintness"
  22. What gives radial velocity in motion of galaxies?
    Doppler Shift
  23. What are the resilts of the mass of Galaxies?
    • Spirials: 1011 - 1012 M
    • Ellipticals: 106 - 1013 M
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Quiz 6
Quiz 6
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