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 19, Problem 26Q
To determine
The difference between Population I and population II stars.
The meaning of stars of one population being regarded as the “children” of the other population.
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Consider the Milky Way disk, which has a 50 kpc diameter and a total height of 600 pc. Suppose
that the Sun orbits precisely at the mid-plane of the disk in a circular orbit. Supernovae explosions
happen randomly throughout the disk at a rate of about 2 per 100 years. Consider a spherical
region around the Sun with a radius of 300 pc. Ignore the Milky Way bulge and halo in this
problem; assume the Milky Way disk is perfectly uniform and extends all the way through the
region of the bulge. (I.e., the Milky Way is modeled *only* as a cylindrical disk--like a hockey puck--
with constant density throughout.)
If a particular supernova goes off at a random location within the disk, what is the probability that it
went off in the 300 pc radius spherical region near the Sun? Express your probability as a
percentage (but without writing the percent sign).
[Hint: there is a 100% probability that the supernova went off somewhere in the volume of the Milky
Way disk; there is a 50% probability that…
Assume that the umber density of stars in the Milky Way is 0.14 pc-3.
There are 10" stars uniformly distributed across the galaxy. Also assume that
there is one supernova every 30 years and all of them have same luminosity.
Find the probablity, P, of a supernova causing extinction on Earth in total life
span of the Sun.
What is the ratio of the percent of metals in extreme Population I stars (3%) to that in extreme Population II stars (0.05%)?
NpopI
NpopII
=
Chapter 19 Solutions
Universe: Stars And Galaxies
Ch. 19 - Prob. 1QCh. 19 - Prob. 2QCh. 19 - Prob. 3QCh. 19 - Prob. 4QCh. 19 - Prob. 5QCh. 19 - Prob. 6QCh. 19 - Prob. 7QCh. 19 - Prob. 8QCh. 19 - Prob. 9QCh. 19 - Prob. 10Q
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