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Star Composition <ul><li>Stars made of H and He </li></ul><ul><li>H is the fuel which turns into He </li></ul><ul><li>H  +...
Star Temperature Less than 3,500 C Red 3,500 – 5,000 C Orange 5,000 – 6,000 C Yellow 6,000 – 7,500 C Yellow-white 7,500 – ...
Apparent Magnitude <ul><li>How bright a star  appears  to be </li></ul><ul><li>Depends on distance, size, and energy outpu...
Absolute magnitude <ul><li>Actual  brightness of a star </li></ul><ul><li>Depends on star’s actual brightness at a distanc...
Measuring Magnitude -30 -25 -20 -15 -10 -5 0 5 10 15 Sun Sirius A Krugar A Apparent Absolute The more negative the magnitu...
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Star Comp, Temp, Magnitude, Parallax

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Star Comp, Temp, Magnitude, Parallax

  1. 1. Star Composition <ul><li>Stars made of H and He </li></ul><ul><li>H is the fuel which turns into He </li></ul><ul><li>H + H He + Energy </li></ul>
  2. 2. Star Temperature Less than 3,500 C Red 3,500 – 5,000 C Orange 5,000 – 6,000 C Yellow 6,000 – 7,500 C Yellow-white 7,500 – 30,000 C Blue white Above 30,000 C Blue Temperature Color
  3. 3. Apparent Magnitude <ul><li>How bright a star appears to be </li></ul><ul><li>Depends on distance, size, and energy output </li></ul><ul><li>What is the brightest star? </li></ul>
  4. 4. Absolute magnitude <ul><li>Actual brightness of a star </li></ul><ul><li>Depends on star’s actual brightness at a distance of 32.6 light years away. </li></ul><ul><li>Astronomers use this type of magnitude as it is more accurate. </li></ul>
  5. 5. Measuring Magnitude -30 -25 -20 -15 -10 -5 0 5 10 15 Sun Sirius A Krugar A Apparent Absolute The more negative the magnitude the brighter the star

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