Exam 57: The Masses of Orbiting Stars

Stars whose absorption lines move back and forth are called ______.

This type of binary star system is detected by using the Doppler shift:

Binary stars are used to measure _____.

Apparent double stars are two stars going around each other.

The ______ is the point between two stars that they revolve around.

Two stars that actually go in front of each other and block their light are called ______.

Using Kepler's 3^rd law you can calculate the mass of an orbiting object by using _____ and _____.