| Width
of Main Sequence – and Stellar Aging |
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
| • | As star converts H to He you |
||||||||||||||||
| have more massive nuclei |
|||||||||||||||||
| – | Pressure related to number of nuclei |
||||||||||||||||
| – | Gravity related to mass of nuclei |
||||||||||||||||
| • | Pressure would tend to drop unless |
||||||||||||||||
| something else happens |
|||||||||||||||||
| • | Temperature must rise (slightly) |
||||||||||||||||
| to compensate |
|||||||||||||||||
| • | Luminosity must rise (slightly) |
||||||||||||||||
| as heat leaks out faster |
|||||||||||||||||
