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Stars

  1. Measurement of star positions and motions
    Astrometry
  2. Amount of light the star gives off- wavelength and color of the stars
    Photometry
  3. Dispersion of light into it's compiler colors to determine the energy
    Spectroscopy
  4. How bright the star looks to the observer
    Apparent magnitude
  5. Six levels of magnitude
    • 1 brightest
    • 6 faintest
  6. Defined as the apparent magnitude a star would have if it which places at a distance of 10 parsecs and 32.6 light years
    Absolute magnitude
  7. Stages of a star
    • Protostar- fetus
    • Fusion ignition infancy- adulthood
    • Red giant- middle age
    • White drawf/black hole- old age death
  8. 3 colors
    • Blue hottest
    • Yellow middle
    • Red cooler
  9. The energy received per second per sq meter at the position of the observer
    Energy flux
  10. Energy output of an object
    Luminosity
  11. Formation of stars
    • Gas and dust
    • Molecular cloud forms
    • Gravitational contraction
    • Protostar formed
    • Bok globules ( cocoon star)
    • Temparture rises-core formed
    • Outer layer blown away and a star is revealed
  12. 4 types of galaxies
    • Elliptical-blob of light
    • Spiral-flat
    • Irreqular-no shape
    • SO-sharesmore then 1 characteristic
Author
lisabug
ID
47965
Card Set
Stars
Description
stars
Updated

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