21st Century Astronomy And Learning Astronomy By Doing Astronomy (fifth Edition)
5th Edition
ISBN: 9780393613360
Author: Laura Kay, Ana Larson, Stacy Palen, George Blumenthal
Publisher: W. W. Norton & Company
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Chapter 5, Problem 23QP
To determine
The words redshifted or blue shifted indicates about the celestial objects.
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Chapter 5 Solutions
21st Century Astronomy And Learning Astronomy By Doing Astronomy (fifth Edition)
Ch. 5.1 - Prob. 5.1CYUCh. 5.1 - Prob. 5.2CYUCh. 5.2 - Prob. 5.3CYUCh. 5.3 - Prob. 5.4CYUCh. 5.4 - Prob. 5.5CYUCh. 5.5 - Prob. 5.6CYUCh. 5 - Prob. 1QPCh. 5 - Prob. 2QPCh. 5 - Prob. 3QPCh. 5 - Prob. 4QP
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- 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_forwardYou observe the H-alpha line of Hydrogen in a distant galaxy to have a wavelength of 754.4 nm. What is the radial velocity of the galaxy? Hint: The rest wavelength of H-alpha is 656 nm.arrow_forwardIn a laboratory, the Balmer-beta spectral line of hydrogen has a wavelength of 486.1 nm . If the line appears in a star’s spectrum at 485.8 nm , what is the star’s radial velocity? Is it approaching or receding? Is this a blueshift or a redshift?arrow_forward
- The Messier Catalog is a. a listing of all the stars within the Local Bubble b. a list of all the HII listings visible without a telescope c. a list of nebulae, star clusters, and galaxies that might be mistaken for a comet far from the sun d. a list of regions where dark clouds large numbers of molecules can be foundarrow_forwardHertzsprung-Russell Diagram Blue or blue-white White Yellow Red-orange Red O Rigel Superglants Belekge Main Sequence Aldergran Glants SunO Alpho Contoun B Sirius B White Dwarts 50,000 20.000 10.000 Surface Temperature (C) 6,000 5.000 3,000 What is the color of the stars shown on the diagram that have the highest surface temperature? O red O yellow blue O white Brightness Increasing O O Oarrow_forwardWhy is it difficult to determine where cosmic rays come from?arrow_forward
- What causes reddening of starlight? Explain how the reddish color of the Sun’s disk at sunset is caused by the same process.arrow_forwardvelocity curve for a double line spectroscopic binary is shown in the sketch. The system is viewed edge-on, i.e., with an inclination angle of i = 90°, so that the maximum possible Doppler shifts for this system are observed. 400 300 So = U, Ani 200 t0 = v Ain i 100 -100 -200 -300 400 O 1 2 3 1 s 1 8: 10 Time (days) Find the orbital period of this binary in days. Doppler Velocity (krn/sec)arrow_forwardMany 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 60900 solar luminosities be if it were located 532 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_forward
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