Homework 5: Due September 3, 2007

1. Read Mystery 10
2. You observe a star that has a spectral line with a rest wavelength of 500 nm. In your observations, the line is shifted to 505 nm. Is the star moving towards you or away from you?
3. (Extra Credit) How fast is the star in question 1 moving?
4. Betelgeuse is red, and Rigel is blue. Why are these stars different colors?
5. Write a new mnemonic (saying) for the spectral classification OBAFGKM.
6. What is the single most important property of a star with respect to its evolution?