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12 Cards in this Set
- Front
- Back
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Wien's Law |
The wavelength at which the most intense radiation occurs |
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The Hipparcos Mission |
Mission which operated from 1989 to 1993; launched a telescope into space for the purpose of measuring parallax angles for more than 40,000 stars |
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BV Filters |
Way to determine temperature; B filter lets through a narrow band of blue wavelengths where the V filter lets through a narrow band of green wavelengths |
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Henry Draper Catalogue |
Developed the system of spectral classification at Harvard in the 1920's |
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Age of a Star Cluster |
Approximately equals the hydrogen-burning lifetime of the most massive main-sequence Stars remaining within it |
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Apparent Magnitude |
A measure of the apparent brightness of an object in the sky |
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Apparent Magnitude |
A measure of the apparent brightness of an object in the sky |
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Absolute Magnitude |
A measure of an object's luminosity: defined to be the apparent magnitude the object would have if it were located exactly 10 parsecs away |
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Spectral Type |
Designated by one of the letters OBAFGKM; tells us a star's surface temperature and color |
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Spectral Type |
Designated by one of the letters OBAFGKM; tells us a star's surface temperature and color |
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Luminosity class |
Designated by a Roman Numeral, is based in luminosity but tells us a star's radius |
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Why are star clusters helpful to astronomers? |
-All star clusters lie in about the same distance from Earth -All star clusters formed at about the same time |
