Name: ____________________

Section:____________________

Cepheid Lab - Answer Sheet

The instructions for this lab are on the web: http://homepages.umflint.edu/~mistark/outreach/cepheid/
It can be accessed from any computer with internet access and a web browser. Write your answers to the questions on this answer sheet and turn it in.

II. Cepheid Data Sheet:

Cepheid Name
Grid Number
P
(Period)
mV
(Apparent Magnitude)
MV
(Absolute Magnitude)
       mV-MV      
(Distance Modulus)
           
           
           
           
           

III. Distance Determination:


IV. Distances to Other Galaxies

1. Near drawing:                                                                     Far Drawing:









2. In a sentence or two compare the apparent sizes of the images in your two drawings. How did the size of some part of the image change as you moved away from it? Write a statement describing the relationship between the apparent size of an object and your distance from the object.














3. The apparent diameter of M100 is: ________________________ in units of: __________


4. The apparent diameter of the Coma Spiral is: ________________________


5. The distance to the Coma Cluster is: ________________________

Calculations:











V. Summary

Write at least one well structured paragraph on a separate sheet of paper summarizing the major points covered in this lab. Be sure mention what a Cepheid is, how you found them, and how you used them to find the distance to M100. Then describe one other method used to estimated the distances to galaxies that we can't see Cepheids in and the basic ideas and assumptions behind this method.