Universe: Stars And Galaxies
Universe: Stars And Galaxies
6th Edition
ISBN: 9781319115098
Author: Roger Freedman, Robert Geller, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 18, Problem 27Q
To determine

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The way, one could distinguish between a newly formed protostar and a red giant as they are located in the same region on the H-R.

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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?
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?
A star with spectral type A0 has a surface temperature of 9600 K and a radius of 2.2 RSun. How many times more luminous is this star than the Sun? (if it is less luminous enter a number less than one) This star has a mass of 3.3 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. Compare this to the lifetime of a A0 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.)
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