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 35Q
To determine
Whether or not, it is possible that a star appears to be bright when viewed through a U or a V filter but dim when viewed through a B filter.
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Consider two stars, A and B, of equal size. You take a spectrum of each star and findthat the flux of star A peaks at a wavelength of 9000 ̊ A and the flux of star B peaksat 3000 ̊ A. What is the relative luminosities of the two stars? Which star is the hotterone? If star A is at a distance of 10 pc, what distance would star B have to be inorder for both stars to appear equally bright as viewed from Earth?
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Chapter 17 Solutions
Universe: Stars And Galaxies
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- What elements are stars mostly made of? How do we know this?arrow_forwardHow would two stars of equal luminosity-one blue and the other red-appear in an image taken through a filter that passes mainly blue light? How would their appearance change in an image taken through a filter that transmits mainly red light?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_forward
- Review this spectral data for five stars. Which is the hottest? Coolest? Most luminous? Least luminous? In each case, give your reasoning.arrow_forwardOur Sun, a type G star, has a surface temperature of 5800 K. We know, therefore, that it is cooler than a type O star and hotter than a type M star. Given what you learned about the temperature ranges of these types of stars, how many times hotter than our Sun is the hottest type O star? How many times cooler than our Sun is the coolest type M star?arrow_forwardUse the data in Appendix I to plot an HR diagram for this sample of nearby stars. How does this plot differ from the one for the brightest stars in Exercise 18.25? Why?arrow_forward
- Which of the following can you determine about a star without knowing its distance, and which can you not determine: radial velocity, temperature, apparent brightness, or luminosity? Explain.arrow_forwardA star is often described as “moving” on an HR diagram; why is this description used and what is actually happening with the star?arrow_forwardSuppose you are given the task of measuring the colors of the brightest stars, listed in Appendix J, through three filters: the first transmits blue light, the second transmits yellow light, and the third transmits red light. If you observe the star Vega, it will appear equally bright through each of the three filters. Which stars will appear brighter through the blue filter than through the red filter? Which stars will appear brighter through the red filter? Which star is likely to have colors most nearly like those of Vega?arrow_forward
- At the average density of the interstellar medium, 1 atom per cm3, how big a volume of material must be used to make a star with the mass of the Sun? What is the radius of a sphere this size? Express your answer in light-years.arrow_forwardHow do stars typically “move” through the main sequence band on an HR diagram? Why?arrow_forwardExplain how we can deduce the temperature of a star by determining its color.arrow_forward
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