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 37Q
To determine
The reason for star peaking in green wavelength do not appear green.
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Chapter 17 Solutions
Universe: Stars And Galaxies
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- Why is the sun orange?arrow_forwardIf a star has a surface temperature of 18,000 K (1.80 ✕ 104 K), at what wavelength (in nm) will it radiate the most energy? Is this a cool or hot star? (Give your answer relative to the Sun.)arrow_forwardA star is moving toward Earth with a radial velocity (speed directly toward or away from Earth) of 40,000 km/s. If we take a spectrum of this star’s light, will we find it to be red shifted or blue shifted? By what fraction are the wavelengths in this star’s spectrum shifted? [Answer: λ0/λ = 0.88]arrow_forward
- If you see a red-hot star, you can be certain that its peak intensity is in the infrared region. Why is this?arrow_forwardTwo stars (a and b) in a binary system have apparent V-band magnitudes of 8.0 and 8.4 mag, and B-V colour indices of 0.3 and -0.5 mag, respectively. (a) Which star is brightest in the V-band? (b) Which star is brightest in the B-band? (c) Which star would appeal bluer to the naked eye? (d) What is the ratio of monochromatic fluxes of the stars in the B-band? (e) What is the total apparent magnitude of the system in the V-band (assuming it is unresolved)?arrow_forwardWhat wavelength ( in nanometers ) is the peak intensity of the light coming from a star whose surface temperature is 4987 Kelvin? What color would we see with our eyes?arrow_forward
- Many of the bright stars in the night sky are highly luminous normal blue stars (such as Acrux), and others are blue giants (such as Rigel) or red giants (such as Betelgeuse). Generally, such stars have a luminosity of 103 to 105 times that of our Sun! Ignoring any effects from our atmosphere, how bright would a star with a luminosity of 8380 solar luminosities be if it were located 620 light years from Earth? (You will need to convert some values.) W/m² For comparison, if you were 1 meter from a regular 100 W light bulb, the brightness would be 7.96 W/ m². (Since stars are not this bright, your answer should be considerably less!) Kind of amazing you can see these things, isn't it?arrow_forwardWhy do hot stars look bluer than cool stars?arrow_forward1. Spectral signatures can be described using luminosity values in different spectral regions. UV Blue Green Red NIR Forest 28 29 36 27 56 Water 22 23 19 13 8 Corn 53 58 59 60 71 Pasture 40 39 42 32 62 Assuming these signatures are influenced by atmospheric effects: is it possible to separate the different categories based on the values in this table? Which band (s) are the most useful for distinguishing between the different classes in this table and why?arrow_forward
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