Astronomy 1021 Chapter Notes - Chapter 12: Roman Numerals, Fusion Power, Parsec
16 Dec 2017
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All stars have pretty much the same composition as our sun. Total energy output of a star is called luminosity which is abbreviated to. L: therefore, two stars that have the same luminosity are outputting the same power. How do we measure stellar luminosities: stellar brightness depends on both how far away a star is and how much light it emits, when talking about how right stars are in the sky this is called. Apparent brightness follows an inverse square law with distance. If we viewed the sun from 10 times the earth"s distance, it would appear 102 = 100 times dimmer. Units of ap are watts per square meter. Most direct way to measure a star"s distance. Annual shifts in a star"s apparent position caused by. More distant stars have smaller parallax angels. Closer the star the larger the parallax.
