IB Physics SL Paper 3 Astrophysics
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Spectral Classes
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O B G A F G K M Oh be a fine girl kiss me <3
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Parallax Method
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Can only be used < ~100 parsecs because the parallax angle would be too small to be measured.
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Parallax Angle
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Half of the angle of separation.
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Apparent Magnitude
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Apparent Brightness observed from Earth.
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Absolute Magnitude
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Apparent Brightness observed from 10pc.
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Magnitude Scale
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The smaller the magnitude, the brighter the star
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Constellation
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Pattern of stars that are not close together.
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Stellar Cluster
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Groups of stars bound by gravity.
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Main Sequence
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90% of stars. Undergo fusion causing pressure that prevents the star from collapsing under the force of gravity.
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Red Giants
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Cool, big, Luminosity III (~4 to 5)
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Super Giants
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Cool, big, Luminosity I (~5 to 6)
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White Dwarfs
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Hot, small, Luminosity VII (~-2 to -3)
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The Big Bang Model
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Space and time originated from a single point in a large explosion
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Cosmic Background Radiation
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Evidence for the Big Bang. Temperature was very high and as the universe expanded it cooled down. The wavelength of the CMB corresponds to a temperature consistent with this cooling down.
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Red Shift
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Evidence for the Big Bang. Indicates that the universe is expanding.
