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 21, Problem 38Q
To determine

(a)

Theradius of the orbit.

To determine

(b)

Theproof that the mass of the x-ray source is at least 3.1times the mass of the Sun by using Newton’s form of Kepler’s third law.

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Sirius is a visual binary with a period of 49.94 yr. Its measured trigonometric parallax is 0.37921" (used to calculate the distance to the system) and, assuming that the plane of the orbit is the plane of the sky, the true angular extent of the semi-major axis of the reduced mass is 7.61" (needs to be converted to radians). The ratio of the distances of Sirius A and Sirius B from the center of mass is aa/aB=0.466. Find the masses of Sirius A and B.
Q1 (oints): A0620-00 is an X-ray binary system, there is a normal star and a compact object. For the normal star the radial orbital velocity is 457 km s and for the compact object it is 43 km s1.They have an orbital period of 0.3226 day. Calculate the mass function.
= 2000 K and a radius of R, A young recently formed planet has a surface temperature T Jupiter radii (where Jupiter's radius is 7 x 107 m). Calculate the luminosity of the planet and 2 determine the ratio of the planet's luminosity to that of the Sun.
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