Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 19, Problem 36Q
To determine
About a Roche lobe, inner Lagrangian point and, the importance of Roche lobes in a close binary star system.
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A 46M Sun
main sequence star loses 1 Msun of mass over 105 years. (Due to the nature of this problem, do not use rounded intermediate values in your calculations including answers submitted in WebAssign.)
How many solar masses did it lose in a year?
By how much will its luminosity decrease if this mass loss continues over 0.8 million years?
Due to the nature of this problem, for all parts, do not use rounded intermediate values in your calculations-including answers submitted in WebAssign.
To determine the number of solar masses lost per year, divide the mass lost by the number of years over which it was lost.
Mlost
tlost-yr
Part 1 of 3
dM =
dM =
MSun/yr
Assume that an O main-sequence star (40,000 K) and a G main-sequence star (5,500 K) have the same radius. How many times brighter is the O star?
LO
LG
=
Star B is located 2.6 times farther from earth than Star A, but both have the same apparent visual magnitude of 1 mag. Which star is intrinsically brighter?How many times brighter is the star?
If a star has an apparent magnitude equal to its absolute magnitude, how far away is it in parsecs? pc
Which of the following is least reasonable regarding the mass of stars?
Group of answer choices
The vast majority of stars fall into the range of 0.08 to 100 solar mass.
Stars which are too small cannot sustain nuclear fusion.
Stars which are excessively big are too sluggish to sustain nuclear fusion.
There are more stars on the low end than on the high end of the mass spectrum.
A brown dwarf has a mass just below the least massive star.
Chapter 19 Solutions
Universe
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