Red Giants And White Dwarfs

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Red Giants And White Dwarfs

  1. 1. Red Giants and White Dwarfs
  2. 2. Stellar Parallax <ul><li>Explain how stellar distances are determined. </li></ul><ul><li>What is stellar parallax? </li></ul><ul><li>Which galaxy is our solar system a part of? </li></ul><ul><li>What is the distance across this galaxy? </li></ul><ul><li>What are the basic physical stellar quantities? </li></ul>
  3. 3. <ul><li>How far is a light year? </li></ul><ul><li>What is a parsec? </li></ul><ul><li>Which 2 stars are our closest neighbours ? </li></ul><ul><li>If the Sun was a marble, what would the Earth be and how far would it be? </li></ul><ul><li>How far would our closest neighbour be from the Earth? </li></ul>
  4. 4. <ul><li>What is meant by “proper motion”? </li></ul><ul><li>Answers follow </li></ul>
  5. 5. Explain how stellar distances are determined. <ul><li>stellar distances are determined by their parallax….  </li></ul>
  6. 6. What is stellar parallax? <ul><li>The angular shift of stars caused by change of observer’s position. </li></ul>
  7. 7. Which galaxy is our solar system a part of? <ul><li>Milky way </li></ul>
  8. 8. What is the distance across this galaxy? <ul><li>100,000 light years </li></ul><ul><li>If the Milky way was reduced to 130 km, then the solar system would be a mere 2 mm across. </li></ul>
  9. 9. What are the basic physical stellar quantities? <ul><li>Luminosity (brightness), tempreture (color), chemical composition, size and mass </li></ul>
  10. 10. How far is a light year? <ul><li>Approximately 9.46 x 10 12 km </li></ul>
  11. 11. What is a parsec? <ul><li>The parallax in arc seconds. </li></ul><ul><li>The distance in which a star must lie in order for its measured parallax to be exactly one arc second. </li></ul><ul><li>3.1 x 10 16 m or 206 263 AU </li></ul>
  12. 12. Which 2 stars are our closest neighbours ? <ul><li>Proxima centauri and Barnard’s star </li></ul>
  13. 13. If the Sun was a marble, what would the Earth be and how far would it be? <ul><li>Earth would be a grain of a sand, and it would be one meter away from the marble (Sun). </li></ul>
  14. 14. How far would our closest neighbour be from the Earth? <ul><li>It would be 270 km away from the Earth, and it would be a marble just like the Sun. </li></ul>
  15. 15. What is meant by “proper motion”? <ul><li>Proper motion is the angular movement from a star across the sky as seen from the Earth, measured in seconds of arc per year. This movement is a result of the stars’ actual motion through space. </li></ul>

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