Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 18, Problem 8CC
To determine
The initiation of star formation in a giant molecular cloud by O and B stars.
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If a contracting protostar is two times the radius of the Sun and has a temperature of only 1890 K, how luminous will it be relative to the Sun?
If a contracting protostar is three times the radius of the Sun and has a temperature of only 3000 K , how luminous will it be relative to the Sun?
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?
Chapter 18 Solutions
Universe
Ch. 18 - Prob. 1CCCh. 18 - Prob. 2CCCh. 18 - Prob. 3CCCh. 18 - Prob. 4CCCh. 18 - Prob. 5CCCh. 18 - Prob. 6CCCh. 18 - Prob. 7CCCh. 18 - Prob. 8CCCh. 18 - Prob. 9CCCh. 18 - Prob. 1CLC
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- Describe the evolution of a star with a mass similar to that of the Sun, from the protostar stage to the time it first becomes a red giant. Give the description in words and then sketch the evolution on an HR diagram.arrow_forwardWhy do nebulae near hot stars look red? Why do dust clouds near stars usually look blue?arrow_forwardAccording to the text, a star must be hotter than about 25,000 K to produce an H II region. Both the hottest white dwarfs and main-sequence O stars have temperatures hotter than 25,000 K. Which type of star can ionize more hydrogen? Why?arrow_forward
- where do hydrogen-buring stars spend most of their time on the H-R Diagram? Is it the main sequence, the red gaint region, horizontal branch or the white dwarf region?arrow_forwardwhy are Cepheid variable stars good distance indicators? What about supernovae?arrow_forwardWhich stars are associated with a planetary nebula? black holes, neutron star's, white dwarf or main sequence stars?arrow_forward
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