Ch 26-2 Characteristics of Stars
5 Common Characteristics of Stars <ul><li>1.  Size </li></ul><ul><li>2. Mass </li></ul><ul><li>3. Color </li></ul><ul><li>...
Size of a Star <ul><li>Stars are divided into 5 main Groups by size </li></ul><ul><li>1.  Neutron Star </li></ul><ul><li>*...
Size of a Star <ul><li>4.  Giant Star </li></ul><ul><li>*The diameter 10 to 100X larger than our sun </li></ul><ul><li>5. ...
Composition   <ul><li>Astronomers use a spectroscope to determine what stars are made of by their spectral lines </li></ul...
Surface temperature   <ul><li>Star color indicates surface </li></ul><ul><li>temperature 3,000* k = Red star = Cool </li><...
Brightness   <ul><li>Brightness of a star depends on 3 things </li></ul><ul><li>  </li></ul><ul><li>1.  Size of a star </l...
Apparent Magnitude   <ul><li>The brightness of a star as observed from Earth  </li></ul><ul><li>Absolute Magnitude </li></...
Hertzsprung- Russell Diagram <ul><li>Shows the relationship between Absolute magnitude and surface temperature   </li></ul>
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Ch 26 2 characteristics of stars

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Ch 26 2 characteristics of stars

  1. 1. Ch 26-2 Characteristics of Stars
  2. 2. 5 Common Characteristics of Stars <ul><li>1. Size </li></ul><ul><li>2. Mass </li></ul><ul><li>3. Color </li></ul><ul><li>4. Temperature </li></ul><ul><li>5. Brightness </li></ul>
  3. 3. Size of a Star <ul><li>Stars are divided into 5 main Groups by size </li></ul><ul><li>1. Neutron Star </li></ul><ul><li>**Can be the distance you travel to school </li></ul><ul><li>2. White Dwarf Star </li></ul><ul><li>**Can be the size of Asia </li></ul><ul><li>3. Medium-sized Star </li></ul><ul><li>**Our own Sun </li></ul>
  4. 4. Size of a Star <ul><li>4. Giant Star </li></ul><ul><li>*The diameter 10 to 100X larger than our sun </li></ul><ul><li>5. Super-giant Star </li></ul><ul><li>*The diameter 1000X larger than sun </li></ul><ul><li>** If our sun were replaced with a SGS the star would extend beyond Mars and Earth would be burned up </li></ul><ul><li>**Die quickly—Short lived stars </li></ul>
  5. 5. Composition <ul><li>Astronomers use a spectroscope to determine what stars are made of by their spectral lines </li></ul><ul><li>  All stars have the similar composition </li></ul><ul><li>Most common element = Hydrogen 60-80% of total mass of a star </li></ul><ul><li>2nd most common element = Helium </li></ul><ul><li>Trace elements = O, Ne, C, N -- 4% of total mass of a star </li></ul>
  6. 6. Surface temperature <ul><li>Star color indicates surface </li></ul><ul><li>temperature 3,000* k = Red star = Cool </li></ul><ul><li>Sun= 6,000*k = Yellow star = Hotter </li></ul><ul><li>  </li></ul><ul><li>50,000*k = Blue-white light = Hottest </li></ul>
  7. 7. Brightness <ul><li>Brightness of a star depends on 3 things </li></ul><ul><li>  </li></ul><ul><li>1. Size of a star </li></ul><ul><li>2. Surface temperature </li></ul><ul><li>3. Distance from Earth </li></ul>
  8. 8. Apparent Magnitude <ul><li>The brightness of a star as observed from Earth  </li></ul><ul><li>Absolute Magnitude </li></ul><ul><li>Put two stars at equal distance from each other you can see which is brighter </li></ul><ul><li>Can’t move stars so must calculate brightness </li></ul><ul><li>A CALCULATION OF ACTUAL BRIGHTNESS </li></ul><ul><li>Brightness for most stars is constant </li></ul>
  9. 9. Hertzsprung- Russell Diagram <ul><li>Shows the relationship between Absolute magnitude and surface temperature </li></ul>
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