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10 Cards in this Set
- Front
- Back
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Arc Second |
One degree split up into seconds (1/3600 of a degree). |
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Light Year |
The distance light travels during one year |
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Absolute Luminosity |
The total power radiated from a star in watts |
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Apparent Luminosity/Brightness |
Power of star light reaching Earth in . |
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Absolute Magnitude |
Apparent Magnitude of a star at a standard distance of 10 parsec. |
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Apparent Magnitude |
How bright a star looks (scale 6 to 1, 1 being the brightest). |
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Black Body |
Hot body who’s emission spectrum depends on its temperature only (stars are considered black bodies because they emit all energy produced). |
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Black Body Radiation |
Radiation from a theoretical “perfect” emitter. |
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Cepheid Variable Star |
Stars that varies periodically in size (not mass!!) and hence luminosity (used to determine distances greater than 10 Mpc). |
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Binary Star |
Two or more stars that orbit around each other. |
