1. To test your understanding of the H-R diagram, do Interactive Exercise 11-1. You can print out your answers, if required. 2. How can observations of a visual binary lead to information about the...

1. To test your understanding of the H-R diagram, do Interactive Exercise 11-1. You can print out your answers, if required.

2. How can observations of a visual binary lead to information about the masses of its stars?

3. What is a radial-velocity curve? What kinds of stellar systems exhibit such curves?