| Stellar Evolution | 389 |
| 13.1The Evolution of a Star | 390 |
| The Sun's Life Story | 391 |
| The Life Story of a High-Mass Star | 392 |
| The Importance of Gravity | 393 |
| 13.2Star Formation | 394 |
| Interstellar Gas Clouds | 394 |
| Protostars | 394 |
| Bipolar Flows from Young Stars | 395 |
| Stellar Mass Limits | 397 |
| 13.3Main-Sequence Stars | 398 |
| Why a Star's Mass Determines Its Core Temperature | 398 |
| Structure of High-Mass and Low-Mass Stars | 398 |
| Main-Sequence Lifetime of a Star | 399 |
| 13.4Giant Stars | 400 |
| Leaving the Main Sequence | 400 |
| Nuclear Fuels Heavier Than Hydrogen | 400 |
| Degeneracy in Low-Mass Stars | 401 |
| 13.5Yellow Giants and Pulsating Stars | 402 |
| Why Do Stars Pulsate? | 402 |
| The Period-Luminosity Law | 404 |
| 13.6Death of Stars Like the Sun | 404 |
| Ejection of a Low-Mass Star's Outer Layers | 404 |
| Re-Modeling: Planetary Nebulas | 405 |
| Planetary Nebulas | 405 |
| 13.7Old Age of Massive Stars | 407 |
| Formation of Heavy Elements: Nucleosynthesis | 408 |
| Core Collapse of Massive Stars | 408 |
| Supernova Explosions | 409 |
| Supernova Remnants | 409 |
| 13.8History of Stellar Evolution Theories | 411 |
| 13.9Testing Stellar Evolution Theory | 412 |
| Extending Our Reach: Measuring the Age of a Star Cluster | 413 |
2002 McGraw-Hill Higher Education