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 18Q
To determine
Whether the result of merging neutron stars brought the materials around today in the interstellar medium
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Chapter 21 Solutions
Universe: Stars And Galaxies
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- Determine the surface gravity on a neutron star. Assume the star has a mass 50% bigger than the Sun, and has a radius of 10 km. Express your answer as a multiple of earth's gravitational acceleration (g), like we did in the examples in class.arrow_forwardWhat phenomena can neutron stars supports?arrow_forwardWhy do you expect neutron stars to spin rapidly?arrow_forward
- 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 =arrow_forwardA Type la supernova is observed and achieves an apparent magnitude of m = 19.89 at peak brightness. The absolute magnitudes of Type la supernovae at peak brightness are known to be M = –19. Determine the distance to the supernovae in units of Мрс. Select one: а. 600 O b. 1000 О с 10 O d. 200 е. 300arrow_forwardwhat is the answer for sub-item (b) if the radius of the neutron star is 90.651 km? (express your answer in the proper SI unit and without scientific notation)arrow_forward
- A main sequence star of mass 25 M⊙has a luminosity of approximately 80,000 L⊙. a. At what rate DOES MASS VANISH as H is fused to He in the star’s core? Note: When we say “mass vanish '' what we really mean is “gets converted into energy and leaves the star as light”. Note: approximate answer: 3.55 E14 kg/s b. At what rate is H converted into He? To do this you need to take into account that for every kg of hydrogen burned, only 0.7% gets converted into energy while the rest turns into helium. Approximate answer = 5E16 kg/s c. Assuming that only the 10% of the star’s mass in the central regions will get hot enough for fusion, calculate the main sequence lifetime of the star. Put your answer in years, and compare it to the lifetime of the Sun. It should be much, much shorter. Approximate answer: 30 million years.arrow_forwardWhy the Neutron stars do not collapse further?arrow_forwardBased on the problem attached, what is the answer for sub-item (b) if the radius of the neutron star is 67.004 km? (express your answer in the proper SI unit and without scientific notation)arrow_forward
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