Key Words

• alpha particle

• Cepheid variable

• close binary

• color-magnitude diagram

• contact binary

• core helium fusion

• core hydrogen fusion

• degeneracy

• degenerate-electron pressure

• detached binary

• globular cluster

• helium flash

• helium fusion

• horizontal-branch star

• ideal gas

• inner Lagrangian point

• instability strip

• long-period variable

• main-sequence lifetime