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Chapter 12 Homework

QuestionAnswer
All stars are born with the same basic composition, yet stars can differ greatly in appearance. Which two factors are most important in determining the current appearance of a star? mass and stage of life
Star A is identical to Star B, but Star A is twice as far from us as Star B. Therefore: both stars have the same luminosity, but the apparent brightness of Star B is four times that of Star A.
Sirius is a star with spectral type A star and Rigel is a star with spectral type B star. What can we conclude? Rigel has a higher surface temperature than Sirius.
What do we need to measure in order to determine a star's luminosity? apparent brightness and distance
Which of these stars has the coolest surface temperature? a K star
Half Earth's distance from the Sun. b0.5AU = 5200 watts/m2
Twice Earth's distance from the Sun. b2AU = 330 watts/m2
Five times Earth's distance from the Sun. b5AU =52 watts/m2
This graph shows how the apparent brightness of an eclipsing binary system changes with time. Which of the four labeled regions represents the system at a time when one star is eclipsing the other? both II and IV
The sketch below shows groups of stars on the H-R diagram, labeled (a) through (e); note that (a) represents the entire main sequence while (c) and (d) represent only small parts of the main sequence. Which group represents the most common type of sta d
The approximate main-sequence lifetime of a star of spectral type O is _________. 3 million years
Which of these stars is the most massive? a main-sequence A star
From hottest to coolest, the order of the spectral types of stars is _________. OBAFGKM
High-mass stars have __________ lifetimes than low-mass stars. much shorter
Study this H-R diagram. What is the spectral type of the star Sirius? (The red arrow helps you locate Sirius on the diagram.) A
What do we mean by the main-sequence turnoff point of a star cluster, and what does it tell us? It is the spectral type of the hottest main sequence star in a star cluster, and it tells us the cluster's age.
Created by: ava.h14
 

 



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