Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 16, Problem 15Q
To determine
Whether the lifetime of Sirius is greater than, less than, or the same as that of the Sun. It is given that Sirius has mass 2.3 times that of the Sun.
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The two stars Sirius A and Sirius B orbit their commoncenter of mass. Sirius A has a mass of 4.12 × 1030kg andSirius B has a mass of 2.04 × 1030kg. Assuming theyeach have circular orbits and they stay 2.99 × 1012mapart, what is the radius of the orbit of Sirius A?
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Chapter 16 Solutions
Universe
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- What elements are stars mostly made of? How do we know this?arrow_forwardAppendix J lists the stars that appear brightest in our sky. Are most of these hotter or cooler than the Sun? Can you suggest a reason for the difference between this answer and the answer to the previous question? (Hint: Look at the luminosities.) Is there any tendency for a correlation between temperature and luminosity? Are there exceptions to the correlation?arrow_forwardNow calculate the radius of Sirius’ white dwarf companion, Sirius B, to the Sun.arrow_forward
- The star Sirius A has an apparent magnitude of 1.5 . Sirius A has a dim companion, Sirius B, which is 10,000 times less bright than Sirius A. What is the apparent magnitude of Sirius B? Can Sirius B be seen with the naked eye?arrow_forwardUse the diagram you have drawn for Exercise 18.25 to answer the following questions: Which star is more massive-Sirius or Alpha Centauri? Rigel and Regulus have nearly the same spectral type. Which is larger? Rigel and Betelgeuse have nearly the same luminosity. Which is larger? Which is redder?arrow_forwardThe temperature of the sun is approximately 5800 K and the temperature of the star Sirius A, the larger star of the Sirius via art, is approximately 10,000 K. The luminosity of Sirius A is about 33 times than Sun. The radiation law gives L=4(3.14) R^2 a T^4 By taking the ratio of the luminosities of Sirius A to the Sun, the relative values of luminosity and temperature can be used to determine the relative value of radius. What is the multiples of the Sun’s radius?arrow_forward
- Define synchrotron radiation?arrow_forwardA star is known to be moving at 8.93km/s toward the earth. If you observe the spectral line to be at 5.66nm, at what wavelength would you expect to measure the spectral line in a lab? Please give your answer in nanometers and include 3 digits.arrow_forwardYou are on an interstellar mission from the Earth to the 8.7 light-years distant star Sirius. Your spaceship can travel with 70% the speed of light and has a cylindrical shape with a diameter of 6 m at the front surface and a length of 25 m. You have to cross the interstellar medium with an approximated density of 1 hydrogen atom/m^3 . (a) Calculate the time it takes your spaceship to reach Sirius. (b) Determine the mass of interstellar gas that collides with your spaceship during the mission. Note: Use 1.673 × 10^−27 kg as proton mass.arrow_forward
- Star 1 emits energy at a rate that is 2 times that of Star 2. If Star 1 also has a radius that is 3 times larger than Star 2, how do the temperatures of the stars compare?arrow_forwardIf the Sun is well approximated by a black body with a temperature of 6,000◦ K, then how does its surface brightness compare (ratio) with the surface brightness of a 12,000◦ K star? How about a 3,000◦ K star?arrow_forwardCalculate the surface temperature of the star Betelgeuse whose λmax is 850 nmarrow_forward
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