Loose Leaf For Explorations: Introduction To Astronomy
9th Edition
ISBN: 9781260432145
Author: Thomas T Arny, Stephen E Schneider Professor
Publisher: McGraw-Hill Education
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Chapter 14, Problem 15QFR
To determine
The description of pulsating star and the reason for stars to pulsate.
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A red giant star might have radius = 104 times the solar radius,
and luminosity = 1730 times solar luminosity.
Use the data given below to calculate the temperature
at the surface of the red giant star.
Data:
solar radius R = 7 x 108 meters
solar luminosity L = 4 x 1026 watts
Stefan-Boltzmann constant
a = 5.67 x 10-8 W m² K-4
(in K)
A: 1226 OB: 1434 OC: 1678 OD: 1963 OE: 2297 OF: 2688 OG: 3145 OH: 3679
The lowest mass for a true star is 1/12 the mass of the sun. What is the luminosity of this star (in units of the sun’s luminosity) based upon mass luminosity relationship? Use the exponent of 4 for easy calculations instead of 3.9
Using solar units, we find that a star has 4 times the luminosity of the Sun, a mass 1.25 times the mass of the Sun, and a surface temperature of 4090 K (take the Sun's surface temperature to be 5784 K for the sake of this problem). This means the star has a radius of.................... solar radii and is a .................... star (use the classification).
Chapter 14 Solutions
Loose Leaf For Explorations: Introduction To Astronomy
Ch. 14 - Prob. 1QFRCh. 14 - Prob. 2QFRCh. 14 - Prob. 3QFRCh. 14 - Prob. 4QFRCh. 14 - Prob. 5QFRCh. 14 - Prob. 6QFRCh. 14 - Prob. 7QFRCh. 14 - Prob. 8QFRCh. 14 - Prob. 9QFRCh. 14 - Prob. 10QFR
Ch. 14 - Prob. 11QFRCh. 14 - Prob. 12QFRCh. 14 - Prob. 13QFRCh. 14 - Prob. 14QFRCh. 14 - Prob. 15QFRCh. 14 - Prob. 16QFRCh. 14 - Prob. 17QFRCh. 14 - Prob. 18QFRCh. 14 - Prob. 19QFRCh. 14 - Prob. 20QFRCh. 14 - Prob. 21QFRCh. 14 - Prob. 22QFRCh. 14 - Prob. 23QFRCh. 14 - Prob. 24QFRCh. 14 - Prob. 1TQCh. 14 - Prob. 2TQCh. 14 - Prob. 3TQCh. 14 - Prob. 5TQCh. 14 - Prob. 7TQCh. 14 - Prob. 8TQCh. 14 - Prob. 9TQCh. 14 - Prob. 10TQCh. 14 - Prob. 1PCh. 14 - Prob. 2PCh. 14 - Prob. 3PCh. 14 - Prob. 4PCh. 14 - Prob. 5PCh. 14 - Prob. 6PCh. 14 - Prob. 7PCh. 14 - Prob. 8PCh. 14 - Prob. 9PCh. 14 - Prob. 1TYCh. 14 - Prob. 2TYCh. 14 - Prob. 3TYCh. 14 - Prob. 4TYCh. 14 - Prob. 5TYCh. 14 - Prob. 6TYCh. 14 - Prob. 7TYCh. 14 - Prob. 8TYCh. 14 - Prob. 9TYCh. 14 - Prob. 10TYCh. 14 - Prob. 11TY
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- The lowest mass for a true star is 1/12 the mass of the Sun. What is the luminosity of such a star based upon the mass-luminosity relationship?arrow_forwardA star begins its life with a mass of 5 MSunbut ends its life as a white dwarf with a mass of 0.8 MSun. List the stages in the star’s life during which it most likely lost some of the mass it started with. How did mass loss occur in each stage?arrow_forwardLook elsewhere in this book for necessary data, and indicate what the final stage of evolution-white dwarf, neutron star, or black hole-will be for each of these kinds of stars. A. Spectral type-O main-sequence star B. Spectral type-B main-sequence star C. Spectral type-A main-sequence star D. Spectral type-G main-sequence star E. Spectral type-M main-sequence stararrow_forward
- You have discovered two star clusters. The first cluster contains mainly main-sequence stars, along with some red giant stars and a few white dwarfs. The second cluster also contains mainly main-sequence stars, along with some red giant stars, and a few neutron stars-but no white dwarf stars. What are the relative ages of the clusters? How did you determine your answer?arrow_forwardThe spectrum of the Sun has hundreds of strong lines of nonionized iron but only a few, very weak lines of helium. A star of spectral type B has very strong lines of helium but very weak iron lines. Do these differences mean that the Sun contains more iron and less helium than the B star? Explain.arrow_forwardArrange the following stars in order of their evolution: A. A star with no nuclear reactions going on in the core, which is made primarily of carbon and oxygen. B. A star of uniform composition from center to surface; it contains hydrogen but has no nuclear reactions going on in the core. C. A star that is fusing hydrogen to form helium in its core. D. A star that is fusing helium to carbon in the core and hydrogen to helium in a shell around the core. E. A star that has no nuclear reactions going on in the core but is fusing hydrogen to form helium in a shell around the core.arrow_forward
- A star with a radius 1.5 times that of the Sun has a surface temperature T=9,000 K. Calculate the luminosity of this star and express your answer in units of the Solar luminosity (the Solar luminosity = 3.84 x 1026 W and the Solar radius = 7 x 108 m)arrow_forwardThe mass-luminosity relation describes the mathematical relationship between luminosity and mass for main sequence stars. It describes how a star with a mass of 4 M⊙ would have a luminosity of ______ L⊙. If a star has a radius 1/2 that of the Sun and a temperature 4 that of the Sun, how many times higher is the star's luminosity than that of the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125) If a star has a radius 2 times larger than the Sun's and a luminosity 1/4th that of the Sun, how many times higher is the star's temperature than that of the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125) If a star has a surface temperature 2 times lower than the Sun's and a luminosity the same as the Sun, how many times larger is the star than the Sun? (If it is smaller by a factor of 8, you would write 0.125 because 1/8=0.125)arrow_forwardWhy massive stars are short lived?arrow_forward
- 7 The luminosity class of a star tells an astronomer: O how long ago the star formed O whether the star is a supergiant, a giant, or a main-sequence star O none of these answers O whether the star is close to us or far away O whether or not the star is surrounded by planets #m 3 с $ 4 % 5 6 & O 7 Carrow_forwardWhy is it that we can describe the life cycle of a star and be confident about it?arrow_forwardWhat size star is the sun? O supergiant O medium giant O white dwarfarrow_forward
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