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The photospheres of red giant stars have the same temperature as those of red dwarf stars. However, their power outpu (luminosity) is much higher. Why is this?

The photospheres of red giant stars have the same temperature as those of red dwarf stars. However, their power outpu (luminosity) is much higher. Why is this?

Applications and Investigations in Earth Science (9th Edition)
Applications and Investigations in Earth Science (9th Edition)
9th Edition
ISBN:9780134746241
Author:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Publisher:Edward J. Tarbuck, Frederick K. Lutgens, Dennis G. Tasa
Chapter1: The Study Of Minerals
Section: Chapter Questions
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Question 2 The photospheres of red giant stars have the same temperature as those of red dwarf stars. However, their power output (luminosity) is much higher. Why is this? Red giants have a much larger radius, and luminosity depends on both temperature and radius. O The first sentence is false; red giants actually have much hotter photospheres than red dwarfs. O Red giant stars are bathed in x-rays from nearby pulsars. O Red giants are experiencing a runaway Question ? use effect. D
Transcribed Image Text:Question 2 The photospheres of red giant stars have the same temperature as those of red dwarf stars. However, their power output (luminosity) is much higher. Why is this? Red giants have a much larger radius, and luminosity depends on both temperature and radius. O The first sentence is false; red giants actually have much hotter photospheres than red dwarfs. O Red giant stars are bathed in x-rays from nearby pulsars. O Red giants are experiencing a runaway Question ? use effect. D
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