Mass Loss from Giant Stars
		� Envelope of red giant very loosely held � Star is so big, gravity very weak at the surface � Degenerate core makes nuclear �thermostat� sluggish � Core doesn�t quickly expand and cool when fusion is to fast � Energy can be generated in �thermal pulses� � Low temperature opaque envelope can also �oscillate� � Energy is transmitted in �pulses� as envelope expands and contracts � Main cause of �Variable Stars�
	� Some Red Giants have very strong stellar winds ejecting envelopes, forming �Planetary Nebulae� � PN called this because some looked like planets in poor telescopes � PN don�t have anything to do with formation of planets