PHY 515 Pretest
The Cepheid Period-Luminosity Relation
Name:
Date:
(please return to your TA or the instructor’s mailbox by 4PM)
1. What two properties of the Cepheids makes them particularly useful for astronomers?
2. Explain the difference between the Type I and Type II Cepheids. What do we find in
the LMC?
3. Why do we sometimes have more than one observation on each night?
4. Read in one image. How big is the image in pixels? What is the area of the image in
square degrees?