Summary

- Measurements astronomers use to measure brightness and color.

• The Magnitude scale, and its relation to Luminosity.

• Spectral Type (OBAFGKM), B-V colors, and Temperature.

- The H-R diagram.

• Plotting color versus magnitude for different kinds of stars. Size, Lifetime, and Mass.

- The life of a star.

• Proto-Star, Main Sequence, Red Giant, Horizontal Branch, Asymptotic Giant Branch, White Dwarf...or maybe Supernova!

• Bigger stars burn faster, become red giants quicker.

- How the H-R diagram can tell us about the age of a cluster.

• The mass of stars that are at the Main-Sequence turnoff point.

• Number of Red Giants, Horizontal Branch Stars, Asymptotic Branch Stars, and White Dwarfs.