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Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
Ch 26 2 characteristics of stars
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Ch 26 2 characteristics of stars

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

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