COSMIC PERSPECTIVE
9th Edition
ISBN: 9780135729458
Author: Bennett
Publisher: PEARSON
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Chapter 15, Problem 58EAP
To determine
To Calculate: The stellar radii of the Sirius A.
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Students have asked these similar questions
12.
A star with spectral type MO has a surface temperature of 3750 K and a radius of 0.63 Rsun: How many
times more luminous is this star than the Sun? (if it is less luminous enter a number less than one)
Answer:
Submit All Answers Last Answer: 0.0923
Incorrect, tries 1/5.
Hint: Use the Luminosity equation, which says that L is proportional to R^2 T^4. If you keep these as
ratios compared to the sun, your L will also come out as a ratio compared to the Sun.
This star has a mass of 0.4 Msun- Using the simple approximation that we made in class, what is the
main sequence lifetime of this star? You may assume that the lifetime of the sun is 1010 yr.
Answer:
Submit All Answers
Compare this to the lifetime of a MO star listed in Table 22.1 (computed using a more sophisticated
approach). Is the value you calculated in the previous problem longer or shorter than what is reported
in the table? (L for longer, S for shorter) (You only get one try at this problem.)
Answer:
Submit All Answers
Sirius A has a luminosity of 26 Lsun and a surface
temperature of about 9400 K.
Part A
What is its radius? (Hint: See Cosmic Calculations 12.2: Radius of a Star.)
Express your answer using two significant figures.
m
Submit
Previous Answers Request Answer
Suppose a star has a luminosity of 7.0x1026 watts and an apparent brightness of 4.0x10-12 watt/m?. How far away is it?
Give your answer in both kilometers and light-years.
Chapter 15 Solutions
COSMIC PERSPECTIVE
Ch. 15 - Prob. 1VSCCh. 15 - Prob. 2VSCCh. 15 - Prob. 3VSCCh. 15 - Prob. 4VSCCh. 15 - Prob. 5VSCCh. 15 - Prob. 6VSCCh. 15 - Prob. 1EAPCh. 15 - Prob. 2EAPCh. 15 - Prob. 3EAPCh. 15 - Prob. 4EAP
Ch. 15 - Prob. 5EAPCh. 15 - Prob. 6EAPCh. 15 - Prob. 7EAPCh. 15 - Prob. 8EAPCh. 15 - Prob. 9EAPCh. 15 - Prob. 10EAPCh. 15 - Prob. 11EAPCh. 15 - Prob. 12EAPCh. 15 - Prob. 13EAPCh. 15 - Prob. 14EAPCh. 15 - Prob. 15EAPCh. 15 - Prob. 16EAPCh. 15 - Prob. 17EAPCh. 15 - Prob. 18EAPCh. 15 - Prob. 19EAPCh. 15 - Prob. 20EAPCh. 15 - Prob. 21EAPCh. 15 - Prob. 22EAPCh. 15 - Prob. 23EAPCh. 15 - Prob. 24EAPCh. 15 - Prob. 25EAPCh. 15 - Prob. 26EAPCh. 15 - Prob. 27EAPCh. 15 - Prob. 28EAPCh. 15 - Prob. 29EAPCh. 15 - Prob. 30EAPCh. 15 - Prob. 31EAPCh. 15 - Prob. 32EAPCh. 15 - Prob. 33EAPCh. 15 - Prob. 34EAPCh. 15 - Prob. 35EAPCh. 15 - Prob. 36EAPCh. 15 - Prob. 37EAPCh. 15 - Prob. 40EAPCh. 15 - Prob. 42EAPCh. 15 - Prob. 44EAPCh. 15 - Prob. 45EAPCh. 15 - Prob. 46EAPCh. 15 - Prob. 47EAPCh. 15 - Prob. 48EAPCh. 15 - Prob. 49EAPCh. 15 - Prob. 50EAPCh. 15 - Prob. 52EAPCh. 15 - Prob. 53EAPCh. 15 - Prob. 54EAPCh. 15 - Prob. 55EAPCh. 15 - Prob. 56EAPCh. 15 - Prob. 57EAPCh. 15 - Prob. 58EAPCh. 15 - Prob. 59EAP
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- A star with a radius 1.7 times that of the Sun has a surface temperature T=10,000 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 %3D 108 m). Choose the option below that most closely matches your answer. Select one: а. 20 O b. 100. O C. 26. O d. 5. O e. 1000arrow_forwardAt 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_forwardUse the diagram you have drawn for Exercise 18.25 to answer the following questions: Which star is more massive-Sirius or Alpha Centauri? Rigel and Regulus have nearly the same spectral type. Which is larger? Rigel and Betelgeuse have nearly the same luminosity. Which is larger? Which is redder?arrow_forward
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