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Can
move mass between stars
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1st (massive) star
becomes red giant
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Its envelope transferred to other star
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Hot (white dwarf) core exposed
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2nd star becomes red giant
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Its envelope transferred to white dwarf
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Accretion disk around white dwarf
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Angular momentum doesnt let material fall
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directly to white dwarf surface
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Recurrent nova explosions
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White dwarf hot enough for fusion, but no
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Hydrogen fuel
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New fuel comes in from companion
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Occasionally ignites explosively,
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blowing away remaining
fuel
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