1. The Sun’s atmosphere has three layers. What are they called and what is their temperature?


2. (a) Stars are identified with a spectral type. What are the spectral types from hottest to coolest?

(b) Rank the following spectral types from hottest to coolest: A6, M2, O8, B4, B2


3. What is the structure of the H-R Diagram? What does it tell us?


4. Describe the characteristic behavior of RR Lyrae and Cepheid variables.


5. What determines if a Cepheid variable star is a Type I or Type II?

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