Hw5 - Eric Couillard Astro 142 5 March 2008 Homework#5 1 Since Minnie is close to a Cepheid star Mickey could use the star as a standard candle

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Eric Couillard Astro 142 5 March 2008 Homework #5 1. Since Minnie is close to a Cepheid star, Mickey could use the star as a standard candle. Using the star's apparent luminosity versus it's absolute luminosity you could determine the distance (the brightness of an object drops off by 1/r^2, where r is the distance between us and the object). Assuming the planet is in another galaxy and we can't use stellar parallax, another possible technique would be using a special kind of supernova, assuming there was one around Minnie. This type of supernova is caused by a white dwarf accumulating enough mass to form a supernova, and this happens at a specific point so we know its precise absolute luminosity. Using this, we can compare its brightness to it's apparent velocity in order to find the distance. Another more accurate possibility is stellar parallax, which is the most accurate method for determining distance. 2.
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This note was uploaded on 04/02/2008 for the course ASTRO 142 taught by Professor Putman during the Winter '08 term at University of Michigan.

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Hw5 - Eric Couillard Astro 142 5 March 2008 Homework#5 1 Since Minnie is close to a Cepheid star Mickey could use the star as a standard candle

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