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Luminosity
- total amount of energy emitted by a star
- la=bright super giants, lb=super giants, ll=bright giants, lll=giants, lV= subgiants, V=main sequence stars
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Parallax
displacement between two apparent objects
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parsec
measure of distance when measuring stars
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absolute magnitude
measure of an objects intrinsic brightness
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apparent magnitude
measure of a celestial body's brightness as observed from earth
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spectral class
O, B, A, F,G ,K ,M
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main sequence
part of hr diagram where most stars are located
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spectroscopic parallax
way of measuring stars distances using H-R diagram
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Binary stars
two stars that orbit around their central mass
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Light Curve
graph of light intensity
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ISM
- interstellar meduim
- The space between the stars is not completely empty, but filled with very dilute gas and dust, producing some of the most beautiful objects in the sky.
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Absorption lines
- lines produced by ISM
- distinguished by wrong ionize states, small line width, multiple components
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emission lines
colored lines that make up part of the emission spectrum
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