Horizons: Exploring the Universe (MindTap Course List)
Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Chapter 9, Problem 12P
To determine

How luminous will it be if a contracting protostar is five times the radius of the Sun and hasa temperature of only 2000 K?

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Suppose a protostar has a luminosity of 157,341 Lo and a surface temperature of 4,540 K (Kelvins). What is the radius of this protostar? [Enter your answer as a multiple of the Sun's radius. I.e., if you find R = 20 Ro enter 20. This problem is easier if you start with the relevant equation and create a ratio using the Sun's values. Recall that the Sun has a surface temperature of 5778 K. ]
If a contracting protostar is 0.5 times as luminous as the Sun and has a temperature of only 1,500 K, how does its radius compare to that of the Sun?
If a contracting protostar is eight times the radius of the Sun and has a temperature of only 2190 K, how luminous will it be relative to the Sun? (Hint: Use the luminosity-radius-temperature relation)
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