EP WEBASSIGN FOR SEEDS/BACKMAN'S FOUNDA
EP WEBASSIGN FOR SEEDS/BACKMAN'S FOUNDA
14th Edition
ISBN: 9780357113325
Author: Seeds
Publisher: CENGAGE CO
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Chapter 13, Problem 2LTL
To determine

The evolutionary stages of the Sun from main-sequence to a black dwarf.

The expected peak color of the Sun’s spectrum for the evolutionary stages of the Sun.

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One way to calculate the radius of a star is to use its luminosity and temperature and assume that the star radiates approximately like a blackbody. Astronomers have measured the characteristics of central stars of planetary nebulae and have found that a typical central star is 16 times as luminous and 20 times as hot (about 110,000 K) as the Sun. Find the radius in terms of the Sun’s. How does this radius compare with that of a typical white dwarf?
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Betelgeuse is a nearby supergiant that will eventually explode into a supernova. At peak brightness, the supernova will have a luminosity of about 20 billion times the Sun. It is 600 lightyears away. All stellar brightnesses are compared with Vega, which has an intrinsic luminosity of about 60 times the sun, a distance of 25 lightyears away, an absolutely magnitude of 0.6 and an apparent magnitude of 0.  a) At peak brightness, how many times brighter will betelgeuses be than Vega?  b) Approximately what apparent magnitude does this correspond to? c) The sun is about -26.5 apparent magnitude. What fraction of the Sun'ss brightness will Betelgeuse be?
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