Lesson 3 Characteristics of stars

Term Definition
Spectrograph an instrument that separates light into colors and makes an image of the resulting spectrum
Apparent Brightness the brightness of a star as seen from Earth
Absolute Brightness the brightness a star would have if it were at a standard distance from Earth
Hertzsprung-Russell Diagram a graph relating the surface temperatures and absolute brightness of stars
Main Sequence a diagonal area on a Hertzsprung-Russell diagram that includes more than 90% of all stars