Binary Stars and Novae
If a white dwarf is in a binary star system and is accreting matter from its companion, a variety of phenomena may occur, including novae and Type Ia supernovae. It may also be a super-soft x-ray source if it is able to take material from its companion fast enough to sustain fusion on its surface. A close binary system of two white dwarfs can radiate energy in the form of gravitational waves, causing their mutual orbit to steadily shrink until the stars merge.
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“There are times when we must sink to the bottom of our misery to understand truth, just as we must descend to the bottom of a well to see the stars in broad daylight.”
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