AST201H1 Lecture 12: AST 201 - lecture 12

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Rule #1 = hotter is brighter if it is the same size. If a star is bluer than it is hotter, if it is redder than it is cooler. In our story, we have come to the conclusion that both stars should be the same temperature. Image that we measured their spectra (or colour) and learn that they are both actually ~6000k. If star b is 100 times more luminous than star a, but at the same temperature it must be much larger. Star b is actually 10x larger than star a. If you know the mass (orbits and calculations) and luminosity (that can be measured) you can figure out how long a star can live. You can get the life expectancy of a star by looking at the hr diagram as well. Stars that are not on the main sequence are stars that have run out of hydrogen in their cores.

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