1. What is the difference between a single-line and a double-line spectroscopic binary? 2. What is meant by the light curve of an eclipsing binary? What sorts of information can be determined from...

1. What is the difference between a single-line and a double-line spectroscopic binary?

2. What is meant by the light curve of an eclipsing binary? What sorts of information can be determined from such a light curve?

3. What is the mass-luminosity relation? To what kind of stars does it apply?