Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 17, Problem 69Q
To determine

(a)

The sum of two stars in a binary Steller system.

To determine

(b)

The mass of each individual star.

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A certain binary system consists of two stars that have equal masses and revolve in circular orbits around a fixed point half-way between them.   If the orbital velocity of each star is v=186 km/s and the orbital period of each is 11.3 days, calculate the mass M of each star. Give your answer in units of the solar mass,  1.99×1030 kg (e.g. if each planet's mass is 3.98×1030 kg, you would answer "2.00").
A planet (in another galaxy) takes 5 000 Earth days to complete one full revolution around its own star (not the Sun). It is exactly as far away from its star as Earth is to its own Sun. Draw a FBD, then determine how many times more or less massive this star is than our sun (in other words, give a factor of mass, e.g “5x larger” or “5x smaller”)
Problem 4. The mass of the sun is denoted by Mo 1. The star UY Scuti has a mass of 10M. Express the mass of this star in kg. 2 AU Figure 2.1: Parsec into Km. In the figure B and C are two diametrically opposite positions of the Earth while it revolves around the sun. The star is located at point A and S is the Sun.

Chapter 17 Solutions

Universe: Stars And Galaxies

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