| Complications
in Stellar Evolution |
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| • | Pressure forces other than thermal gas |
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| pressure |
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| – | Reminder:
We’ve been assuming that when star |
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| loses energy it contracts and actually heats up. |
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| Clearly not all objects do this (eg. Earth) |
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| • | Convection bringing in fuel from outer |
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| regions |
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| • | Mass loss from stellar wind, or mass gain |
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| from nearby star |
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