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 33Q
To determine
(a)
The reason why given equation is correct.
To determine
(b)
The color indices for the Sun, Bellatrix and Betelgeuse.
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The Hα spectral line has a rest wavelength of 6562.8 ˚A (remember: 1 ˚A = 10−10 m). In star A, the lineis seen at 6568.4 ˚A, in star B it’s seen at 6560.3 ˚A, and in star C it’s seen at 6562.8 ˚A. Which star ismoving the fastest (along the line of sight) and what is the radial velocity of each star?
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Chapter 17 Solutions
Universe: Stars And Galaxies
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- A star has a parallax angle of 0.0270 arcseconds and an apparent magnitude of 4.641. The distance to this star is 37.03 parsecs and the absolute magintude is 1.79. 18: What is the luminosity of this star? (HINT: The luminosity of the Sun is 3.85×1026 W.) Using the Forumla M1 - M2 = -2.5 log(L1/L2) the absolute magnitude of the Sun is 4.8arrow_forwardThe temperature of a star can be determined from Amax, the wavelength of radiation that the star emits most intensely. The wavelength, λmax, is given for several stars in the table below. Star Antares λmax 934 nm Canopus 397 nm Regulus 223 nm The Sun 502 nm Vega 311 nm Based on their most intensely emitted wavelengths as presented in the table in the problem statement, rank the following stars in order of increasing surface temperature Antares Canopus Regulus The Sun Vega Increasing Surface Temperaturearrow_forwardLet us imagine that the spectrum of a star is collected and we find the absorption line of Hydrogen-Alpha (the deepest absorption line of hydrogen in the visible part of the electromagnetic spectrum) to be observed at 656.5 nm instead of 656.3 nm as measured in a lab here on Earth. What is the velocity of this star in m/s? (Hint: speed of light is 3*10^8 m/s; leave the units off of your answer)arrow_forward
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