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Ch 26.2 Properties of Stars

Ch 26.2 Properties of Stars. 1. Color & Temperature Blue = Hottest (30 000 K surface temp.) Yellow = (5000 – 6000 K; sun like) Red = Coolest (3000 K). Why might one star appear brighter than another? Closer Bigger Hotter. Properties of Stars 2. Star Brightness (Magnitude ).

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Ch 26.2 Properties of Stars

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  1. Ch 26.2 Properties of Stars 1. Color & Temperature Blue = Hottest (30 000 K surface temp.) Yellow = (5000 – 6000 K; sun like) Red = Coolest (3000 K)

  2. Why might one star appear brighter than another? • Closer • Bigger • Hotter Properties of Stars2. Star Brightness (Magnitude)

  3. Properties of Stars2. Brightness or Magnitude Ratings Magnitude = Brightness rating 1st 2nd 3rd 4th 5th 6th Brightest Dim (Negative #s are VERY BRIGHT)

  4. Apparent Brightness (Magnitude) The brightness of a star as it appears from Earth (Decreases w/ distance) Sun (-26.72), Betelgeuse (-0.50) Absolute Brightness (Magnitude) How bright the star REALLY is. Sun (4.8), Betelgeuse (-7)

  5. Properties of Stars 3. Size & Mass Once astronomers know a star’s temp & absolute brightness, they can estimate its diameter & calculate volume.

  6. Properties of Stars4. Composition Stars vary in their chemical compositon. Young stars start off as mostly hydrogen. As stars age, they consume lighter elements like hydrogen and increase their abundance of heavier and heavier elements. Spectroscopes are used to determine a star’s composition.

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