Frame descriptions:

1. In a binary system system, one star evolves to a white dwarf
2. At some future time, its companion runs out of hydrogen fuel and evolves for a period of time into a giant star. (This is quite usual, our own sun will do this at some point in future).
3. As a giant star, the companion is far larger than before. Some of its outer material can be captured by the white dwarf.
4. The white dwarf reaches the Chandrasekhar limit of around 1.4 solar masses, and can no longer support itself. It undergoes core collapse and a type 1a supernova event takes place.

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