Building And Interpreting HR Diagrams

Question 1

Draw and label an H-R diagram, indicating the physically meaningful ranges for stellar surface temperatures and luminosities

Question 2

Identify and draw the main sequence on the H-R diagram and explain its physical origin

Question 3

Describe the different types of stars found on the main sequence, carefully distinguishing what they have in common and what is different about them

Question 4

Describe and draw how the ages and sizes of stars can be represented in an H-R diagram

Question 5

Identify and name patterns or groupings of stars in the H-R diagram

Question 6

Explain what a star’s luminosity class tells us about a star

Question 7

Distinguish between a star’s luminosity and luminosity class

Question 8

Given a star’s luminosity class and spectral class, state or estimate its surface temperature, main-sequence lifetime, luminosity, age, mass, colour, likely end-state (not all factors can be determined from all combinations of luminosity class and spectral class)

Question 9

Explain how and why a star’s main-sequence lifetime is related to its mass

Question 10

Explain why some stars live longer than others and identify those types which live the longest

Question 11

Estimate the age of a star cluster by examining the H-R diagram of its members